Answer:
The two major causes of the inherited genetic variation are 1-mutations during DNA replication and 2-crossing over during meiosis
Explanation:
The mutations are changes in the genetic information that may be inherited when they occur in germline cells (i.e. sperms and ova). Mutations include single nucleotide polymorphisms (SNPs), insertions and deletions (collectively named indels), and major chromosome arrangements such as, for example, aneuploidy, centric fusion, duplications, etc. On the other hand, the crossing over or recombination is the exchange of genetic material between non-sister chromatids of homologous chromosomes during Prophase I of Meiosis. Recombination is a phenomenon that generates new genetic combinations in the gametes and thus increase genetic diversity. Both germline mutations and crossing over events increase genetic variation in the offspring of the next generation, thereby these phenomena represent sources of inherited variation.
The epiglottis is a:_________.
a. muscle that moves the trachea out of line with the pharynx during swallowing.
b. flap of cartilage that flips down to cover the entry to the trachea during swallowing.
c. muscle that moves the esophagus in line with the pharynx during swallowing.
d. sphincter that closes off the entry to the trachea during swallowing.
Answer:
b. flap of cartilage that flips down to cover the entry to the trachea during swallowing
Explanation:
The function of the epiglottis is to prevent food and liquids from entering the windpipe (trachea) and the lungs. It is a flap of cartilage that stands upright when we breathe, allowing air to pass into the larynx and lungs. But while we are eating or drinking, it flips down over the opening of the trachea to prevent food and liquids from getting in there.
Hope that helps.
Which is least likely to be impacted by runoff from a factory? A) river B) groundwater C) lake D) ocean
Answer:
Groundwater
Explanation:
The factories mostly need large quantities of water to carry out their production precesses, however, as well as they need natural recources for their operation, they also dispose of them and a large part of the environmental contamination is due to the release of substances emitted by these. It´s very easy for toxic waste to contaminate rivers, lakes and aceans. Groundwater on the other hand is more complicated to contaminate because it´s found in aquifers below the surface of the arth, making by these factories to reach these places; althouh not impossible.
answer asapppp
Prokaryotes, like most living organisms, need movement to locate food and to survive. If a prokaryote needed to move to a new food source.
which structure would it use for locomotion?
pilli
2
capsule
-flagellum
so
chromosome
Answer: The answer is flagellum
Explanation: Prokaryotes are single-celled organisms belonging to the domains Bacteria and Archaea, and flagellum is a whip-like structure that allows a cell to move. They are found in all three domains of the living world: bacteria, archaea, and eukaryota, also known as protists, plants, animals, and fungi. Also The primary role of the flagellum is locomotion, but it also often has function as a sensory organelle, being sensitive to chemicals and temperatures outside the cell. Flagella are organelles defined by function rather than structure. Flagella vary greatly.
( hope this helped )
Answer:
Flagellum
Hope this helps!
Explanation:
answer the questions.
Answer: 1. How can a healthy lifestyle lead to a healthy heart.
The heart is one of the vital if not the most vital organ of the human body,this is because it is the heart that pumps blood into systemic circulation so that the other body organs,tissues and cells can function adequately.
Any disease or injury to the heart virtually affects all other parts of the body. Therefore a healthy and proper functioning heart is important and this can only be achieved through a healthy lifestyle.
Lifestyles such as;
- Regular exercise/physical activity which will help one to loose excess weight and maintain physical fitness because when one is overweight,fat deposits on the wall of the artery narrowing the lumen/wall, this in-turn causes blood to exert more pressure as it moves through the artery and in-turn lead to hypertension and other heart conditions.
- Stop or limit the intake of alcohol because it increases your chances of getting stroke,heart attack and hypertension through the damage of heart muscles.
- Drinking enough water; this helps the kidney to filter away waste from the body preventing the waste from building up/accumulating in the body especially the heart and as such causing heart problems.
Managing of stress very well to prevent a higher risk of heart disease.
-Eat a healthy diet and manage your blood cholesterol level to prevent damage to heart muscles and blood vessels which will in-turn lead to cardiovascular disease.(High density cholesterol HDL is the good type of cholesterol and low density cholesterol (LDC) is bad for the body.
- Regular visit to a cardiologist when one has a family history of hypertension or any other heart disease.
2. HOW IS HYPERTENSION A BLOOD RELATED DISEASE?
Hypertension is a blood related disease because hypertension is caused when the force of blood along the lumen of artery (artery wall) is higher than normal. This exerted pressure by the blood gets too intense enough to cause a heart problem or a hear disease.
When the pressure gets too intense enough to rupture the artery wall,the individual comes with a heart condition known as stroke.
Which statement best describes the relationship of photosynthesis and energy?
The process of photosynthesis is energy-storing because the process converts light energy into chemical energy,
which is stored in the bonds of glucose.
The process of photosynthesis is energy-releasing because the process converts light energy into free energy that
can be used for cell functions.
The process of photosynthesis is energy-conserving because no energy is used throughout the process of forming
glucose and oxygen molecules.
The process of photosynthesis is energy-wasting because photosynthesis is an inefficient process that depletes
the cell of energy stored in the bonds of glucose.
on Edg
Answer:
A. The process of photosynthesis is energy-storing because the process converts light energy into chemical energy
Explanation:
I would say A because photosynthesis is a process in which uses light energy to split water molecules into hydrogen and water molecules, which means light energy is converted into chemical energy. And energy is also stored in the leaf temporarily as starch.
Hope this helps. ❤❤❤
The list below represents some dominant and recessive traits observed in pea plants.
Dominant
Recessive
Green pods (G) Yellow pods (g)
Smooth seeds (S) Wrinkled seeds (s)
To produce 100% offspring with yellow pods and wrinkled seeds, what parental genotypes must a researcher use?
O GGSS X Ggss
ggSS X GgSS
O GGss X SSGG
ggss X ggss
Answer:
ggss x ggss
Explanation:
To produce 100% offspring having yellow pods (g) and wrinkled seed (s), we need to cross two organisms having yellow pods and wrinkled seeds.
You'll understand more by the Punnett square in the attached file.
A lichen is an organism that structurally appears to be a single organism. But a lichen is actually two different organisms—a fungus and green algae—living together as one organism. The fungal partner derives its nutrition from the photosynthesizing algae. How does a lichen differ in its photosynthetic activity from Elysia chlorotica, the sea slug that’s considered to be a photosynthesizing animal? A. In lichens, the fungi photosynthesize on their own, while Elysia chlorotica forms a relationship with a photosynthesizing plant. B. In lichens, the relationship with the algae lasts throughout the life cycle, but in Elysia chlorotica, the relationship occurs only during the immature juvenile stage of the slug’s life cycle. C. Lichens can photosynthesize only because of the living algal partner, while Elysia chlorotica incorporates chloroplasts from algae into its cells. D. In lichens, the association between the fungi and algae is permanent, while Elysia chlorotica associates with a photosynthesizing organism only when it requires food.
Answer:
Option C
Explanation:
Lichens can photosynthesize only because of the living algal partner, while Elysia chlorotica incorporates chloroplasts from algae into its cells.
Elysia chlorotica which is a form of sea slug feeds on a specie of the genus Vaucheria (an algae) and then retains only the chroloplasts of these algae which it uses for its own supply of energy.
The algal partner in lichens is the photosynthesizing partner. It produces food and this is its role in the relationship. The fungi are heterotrophs and cannot photosynthesize food. The fungi contribute to the relationship my absorbing mineral and water and presents it to the algae.
Answer:
Lichens can photosynthesize only because of the living algal partner, while Elysia chlorotica incorporates chloroplasts from algae into its cells.
Explanation:
Labrador retrievers may have yellow fur, chocolate fur, or black fur. Coat color is determined by two genes. "E" determines dark coat and "e" light coat color. "B" determines whether the dark fur will be black, which is dominant, or brown. If you mate two chocolate labs together, what color offspring can they have
Which organism in the food web below is likely to store the least energy?
boa constrictor
beetle
coati
poison dart frog
sloth
strangler fig
fungus
fruit bat
O A. Sloth
B. Fruit bat
O C. Strangler fig
O D. Boa constrictor
Answer:
a-Sloth
Explanation:
In pea plants there is a dominant allele (A) for green pods and a recessive allele (a) for yellow pods. Suppose a heterozygous plant is crossed with a plant that has yellow pods. Complete the sentences about this monohybrid cross with the correct terms.
The phenotype of the heterozygous plant is
The genotype of the heterozygous plant is
The genotype of the plant with yellow pods is
The genotype of the gametes produced by the heterozygous plant is
The genotype of the gametes produced by the plant with yellow pods is
The expected frequency of F_1 plants with yellow pods is
The expected frequency of F_1 plants with the genotype AA is
Aa
75% A and 25% a
25%
50% A 50% a
0%
green pods
75% AA and 25% Aa
AA
yellow pods
75%
aa
50%
100% A
100% a
Answer and Explanation:
The phenotype of the heterozygous plant is green podsThe genotype of the heterozygous plant is AaThe genotype of the plant with yellow pods is aaThe genotype of the gametes produced by the heterozygous plant is 50% A 50% aThe genotype of the gametes produced by the plant with yellow pods is 100% a The expected frequency of F_1 plants with yellow pods is 50%The expected frequency of F_1 plants with the genotype AA is 0%Cross) a heterozygous plant is crossed with a plant that has yellow pods
Parental) Aa x aa
Phenotype) Green pods Yellow pods
Gametes) A a a a
50% 50% 100%
Punnet Square) A a
a Aa aa
a Aa aa
F1) 2/4 = 1/2 = 50% Aa, Plant with Green pods
2/4 = 1/2 = 50% aa, Plant with Yellow pods
In the given case, the correct terms are:
The phenotype of the heterozygous plant is green pods The genotype of the heterozygous plant is Aa The genotype of the plant with yellow pods is aa The genotype of the gametes produced by the heterozygous plant is 50% A 50% a The genotype of the gametes produced by the plant with yellow pods is 100% a The expected frequency of F_1 plants with yellow pods is 50% The expected frequency of F_1 plants with the genotype AA is 0%It is given that A gives green color which is dominant and a gives yellow pods which is a recessive trait. So in heterozygous conditions, only the dominant character will express itself therefore green color pods
The phenotype of heterozygous plants is Green podsIn heterozygous conditions, the alleles of a genotype are different. Therefore one allele is A and the other is a
The genotype of the heterozygous plant is AaThe yellow color of pods is a recessive trait and recessive trait if expressed only in the same alleles conditions that mean it is given by allele a. Therefore, the genotype of yellow pods is aa
The genotype of the plants with yellow pods is aaThe alleles in the heterozygous conditions are A and a so half of the gametes will have A and the other half have a
The genotype of gamete produced by heterozygous plants are 50% A and 50% aThe yellow pods are obtained by genotype aa. All the gametes are a
The genotype of gametes produced by the plants with yellow pods is 100% aCross:
A a
a Aa aa
a Aa aa
In the cross, there are 2 genotypes produced as aa out of four. So 2/4 × 100 will give 50%
The expected frequency of F1 plants with yellow pods is 50%There are no genotypes obtained as AA in the cross. Therefore, 0 out of 4 offspring will give 0%
The expected frequency of F1 plants with genotype AA is 0%Learn more:
https://brainly.com/question/12355615
Please help! will give brainlist!
Answer:
mark me i will send you the essay
If fossil species A is consistently recovered from geological deposits beneath layers containing fossil species B, then A is considered to be older than B. This relative dating technique is based on the principle of Group of answer choices fluorine analysis. paleomagnetism. geolayering. superposition.
Answer:
superposition
Explanation:
Dating consists of ordering geological events according to the time they occurred, which ones occurred first, and which ones occurred latterly. This dating can be done by using the superposition geological principle.
Sediments can be incrusted in horizontal layers in the ground, called stratum. Different stratum can give us information about the environment in the past. They keep information about the age and the conditions under which the sediments got deposited.
Some geological principles allow us to date, relatively, the age of different geological events in the past.
Sediment layers place in a temporal sequence, let us know that the older layers are located in an inferior position concerning the newer layers. Hence, fossil species placed in more inferior layers are supposed to be older than fossil species found in more superficial layers.
How do you think pollination takes place in flowering plants?
Answer:
My answer is down below.
Explanation:
Pollination occurs when the transfer of pollen grains from the anthers to the stigma of a flower of the same species take place. After reaching the stigma of the flower of the same kind of plant, the pollen grains absorb moisture from the stigma surface and begins to grow a tube. This tube is called the pollen tube.
Explanation:
insects typically pollinate flowers as they move from plant to plant searching for food. when an instects lands on a flower to feed, pollen grains sticks to its body. As the instects moves to another flower of the same species, these pollen grains are transferred to the flower's stigma and pollination occurs.
PLEASE HELP ME ASAP Which statement describes surface waves? They arrive before S waves. They travel faster than P waves. They are produced by P and S waves. They travel deep below Earth’s surface.
Answer:
They are produced by P and S waves
Explanation:
Got it right on Edge 2020
Answer:
produced by p and s waves
Explanation:
Which of the following statements is false? Unselected We clear and swallow over 2 million alveolar macrophages per hour. Unselected Alveolar surfaces are usually sterile. Unselected Remarkably efficient alveolar macrophages crawl freely along the internal and external alveolar surfaces. Unselected Huge numbers of infectious microorganisms are continuously carried into the alveoli.
Answer:
Remarkably efficient alveolar macrophages crawl freely along the internal and external alveolar surfaces
Explanation:
The alveolar macrophages are present on the internal lumenal surfaces of the alveolar ducts, the alveoli, and the bronchioles.
Alveolar macrophages are phagocytes that uses several surface receptors to release many secretions, to interact with other cells and molecules.
But the alveolar macrophages are intact to the inner surface only and do not crawl freely along the internal and external alveolar surfaces.
Hence, the correct option is " C".
Question 4 of 18
These box plots show the prices for two different brands of shoes.
65 70 75 80 85
Brand A
HTH
20
65
80 85
95
Brand B
TH
TT
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
Price ($)
Which statement is the most appropriate comparison of the spreads?
Answer:
Brand B
Explanation:
brand B is correct
Which characteristic describes the whale but not its food source, the phytoplankton? The whale is heterotrophic. The whale has cell walls. The whale is unicellular. The whale is a prokaryote.
Answer:
A. The whale is heterotrophic.
Explanation:
The whale is an aquatic animal that is heterotrophic in nature. Heterotrophic means that this animal lacks the ability to manufacture its own food because it depends on plants and animals as a source of food energy. Since the Whale is dependent on phytoplankton for food, this means that it is not a producer of food and as such is heterotrophic.
Phytoplankton is a marine alga. Algaes are prokaryotes and this means that they are unicellular animals without a membrane-bound nucleus. The Cell wall is mostly a characteristic of plants. So the first option is a perfect description of the whale and not its food source which is the phytoplankton.
Answer:
ExplanationThe whale is heterotripic
Not all of the members of everyday categories have the same. Most fish have gills, fins, and scales. Sharks lack the feature of scales, yet they are still categorized as fish. This is most problematic for the __________ approach to categorization.
Answer:
species to
Explanation:
how does increase in temperature disturb water cycle ?
Answer: Climate change intensifies this cycle because as air temperatures increase, more water evaporates into the air. Warmer air can hold more water vapor, which can lead to more intense rainstorms, causing major problems like extreme flooding in coastal communities around the world.
enlist the sources of nitrogen fertilizer
Answer: hope this helps....
Explanation: organic sources of nitrogen include alfalfa meal, which supplies 2 percent to 3 percent nitrogen and lasts approximately one-third of the year. Dairy and poultry manure also can release suitable amounts of nitrogen fresh or composted manure can also be from an acceptable organic source such as small independent farms.
Answer:
nitrogen is the main source of fertilization to plants
Explanation:
the main and big source of nitrogen fertilizers are atmospheric nitrogen which has to be converted into nitrates because plants cannot pick up the atmospheric nitrogen directly but now genetic engineering has produced plants that can fix nitrogen directly from environment its main source is nitrogen cycle
Which water source may become polluted as it travels over land?
ponds
groundwater
oceans
runoff
Answer:
I believe runoff water
a cell "x" contain a cell wall large central vacuole and a nucleus at the periphery . cell"x"is __________ options 1) plants cell 2) animal cell 3) bacterial cell 4) prokaryotic cell
Answer:
plant cell
Explanation:
Plant cells have a cell wall to maintain cell shape. They also have a large central vacuole for water storage and a nucleus at the periphery.
Hope that helps.
why Reproduction is necessary for the survival of a species on this earth?
Answer:
Reproduction is vital to the success of a species. For a species to survive it must be able to produce more offspring than it loses though old age, disease, and predation.
Explanation:
Living things can reproduce in different ways – asexual reproduction and sexual reproduction.
Hope it helps.
How would you conduct your investigation? In your answer, explain your independent and dependent variables
Answer:
The dependent variable is the growth rate of the plant. The independent variable is the type of fertilizer used over time. There will be three groups of tomato plants raised from seed: one group will be a control group without any fertilizer, the second group will be planted in soil with artificial fertilizer, and the third group will be planted in soil with compost. The height of the plants will be measured every five days, over a 30-day period.
Explanation: plato
How many polypeptide chains are shown in the tertiary protein structure in Model 3?
Answer:
3
Explanation:
Here, we are required to determine how many polypeptide chains are shown in the tertiary protein structure in Model 3 as shown in the picture attached.
The tertiary protein structure in Model 3 has 1 polypeptide chain/backbone.
Protein tertiary structure is simply defined the three dimensional shape of a protein. By convention, the tertiary structure (TS) of a protein will have a single polypeptide chain otherwise known as the polypeptide backbone with one or more protein secondary structures as the case may be. However, amino acid side chains may interact and bond in a variety of ways as evident in the diagram given.
Read more:
https://brainly.com/question/17338734
An ecologist hypothesizes that predation by a particular owl species is the major factor controlling the population of a particular rabbit species. The first step in testing this hypothesis would be to determine
Answer:
The correct answer is - whether owl eats the rabbits.
Explanation:
A hypothesis is a proposed answer for an unexplained event that doesn't fit into the current acknowledged logical hypothesis. The essential thought of a hypothesis is that there is no pre-decided result.
The Hypothesis can be proved or disproved by scientific research that has various steps but initiailly testing the hypothesis is essential:
- Making assumptions.
- Stating the research and null hypotheses
- Selecting the sampling pattern and specifying the test statistic.
- calculating the test statistic.
-Making a decision and interpreting the results.
Thus, the first step after forming a hypothesis is to check or test the hypothesis which is null hypothesis -whether owl eats the rabbits.
You are relaxing, having a snack and watching TV, when suddenly the entire house begins to shake violently. The activity of your ________ quickly decreases, while that of your ________ increases. autonomic nervous system; somatic nervous system parasympathetic division; sympathetic division sympathetic division; somatic nervous system sympathetic division; parasympathetic division somatic nervous system; autonomic nervous system
Answer:
parasympathetic division; sympathetic division
Active transport makes it possible for cells to:______.
a. transport out secretory products and waste material against concentration gradients.
b. take up nutrients from the environment against concentrations gradients.
c. maintain nonequilibrium intracellular concentrations of ions such as Na , K , Ca2 , and H .
d. establish an electrical potential across the membrane.
e. All of the above are correct.
Answer:
e. All of the above are correct.
Explanation:
Active transport is a type of transport in living systems in which molecules/ions/substances are moved or transported against their concentration gradient i.e. from a region where the substance is LOW to a region which it is HIGH, across a membrane. Since molecules are transported across a memembrane against their concentration gradient, an energy input in form of ATP is needed to do so.
Active transport is used in living systems to transport out secretory products and waste material against concentration gradients, take up nutrients from the environment against concentrations gradients etc. Since ions are substance moved by active transport from a low region to high region, there is an imbalance in the intracellular concentration of ions, such as Na, K etc.
Since there is no equilibrium in the concentration of ions on opposite sides of the membrane, an electric potential is formed across the membrane i.e. one part of the membrane will be more positively charged than the other.
Mutations in a gene occur at a rate of one nucleotide every 10 million years. The gene sequence differs by 6 nucleotides between two related organisms. How long ago did these organisms split from a common ancestor
Answer:
Total time split from a common ancestor = 30 million
Explanation:
Given:
Number of nucleotide = 6
Number of organism = 2
Rate one nucleotide = 10 million year
Computation:
Total time split from a common ancestor = [Rate one nucleotide / Number of organism]Number of nucleotide
Total time split from a common ancestor = [10 million / 2] 6
Total time split from a common ancestor = [5 million] 6
Total time split from a common ancestor = 30 million
Which piece of evidence would strongly support the RNA-first hypothesis? finding a protocell that could carry on metabolism as well as reproduce discovering a way to make RNA more stable than DNA finding a mechanism whereby proteins could assemble DNA out of free nucleotides being able to build microspheres that contain only protein and RNA finding a living organism that uses RNA as its genetic material
Answer:
The correct answer is - finding a living organism that uses RNA as its genetic material.
Explanation:
The RNA world theory recommends that life on Earth started with a simpler form of RNA particle that could duplicate itself. The RNA world speculation recommends that life on Earth started with a basic RNA particle that could duplicate itself without assistance from different atoms.
The RNA world theory is upheld by RNA's capacity to store, transmit, and copy hereditary data, as DNA does. RNA can go about as a ribozyme, an uncommon kind of enzyme. Since it can play out the role of both DNA and enzyme, RNA is accepted to have once been equipped for supporting free living things.
According to the hypothesis is that RNA, a nearby relative of DNA, was the main hereditary atom to emerge around 4 billion years back, however in a simpler form of life that later developed into the RNA and DNA particles that we have in life today
Thus, The correct answer is - finding a living organism that uses RNA as its genetic material