B)Mendelian genes are at specific loci on the chromosome and,in turn, segregate during meiosis.
Describe the two patterns Wilson observed regarding the distribution of ants on Melanesian islands.
Answer:
human invasions and expansion/contraction cycles during glacial-interglacial periods
Explanation:
In 1961, the biologist Edward Osborne Wilson studied the distributional, behavioral and morphological characteristics of ants living in the Melanesian archipelago. After his study, Wilson then proposed a hypothesis to explain the biogeographic dynamics of Melanesian ants which has been referred to as the 'taxon cycles'. Taxon cycles are defined by stages of expansion and contraction in the range of distribution of species combined with evolutionary adaptive changes in their ecological niches. These cycles can be represented by historical processes of invasion that resemble human invasions. In the last years, it has been shown that Wilson's hypothesis is supported by predictions obtained by modern methodologies for investigating taxon cycles (i.e., evolutionary phylogenetic methods).
What are some changes that can occur in ecosystems?
Answer:
There are so many changes that occur in ecosystem, they are:Habitat change. climate change. invasive species. over exploration. pollution.Explanation:
Hope it helps you.Seasons, tide cycles, population sizes, landscape changes, succession evolution, and climate change are instances of changes that can occur in ecosystems.
What is an ecosystem?An ecosystem is a geographical area wherein plants, animals, and other organisms, along with weather and landscape, coexist to form a life bubble.
The instances of changes that can occur in ecosystems can be seasons, tide cycles, population sizes, landscape changes, succession evolution, and climate change.
Thus, these are some changes that can occur in the ecosystem.
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7. Wha
9. Marfan syndrome is an inherited condition that affects the connective tissue, resulting in
unusually long bones and spinal curvature, as well as vision, cardiac, and respiratory
problems. The syndrome tends to become increasingly severe over time. The following
pedigree shows inheritance of Marfan syndrome in a multigenerational famil (5)y.
8. Wh
5
9. Tra
Th
the
III
Be
us
wi
a) How is this syndrome inherited (dominant, recessive or sex-linked)?
2
b) Can you determine individual 114's genotype? Explain.
b.
с
c) Individual III and I12 are considering having another child. What is the probability that
this child will have Marfan syndrome? Explain using a Punnett square.
Answer:
The correct answers are :
a) syndrome Could be autosomal recessive or dominant
b) If it is autosomal recessive - no ,
and if it is autosomal dominant - yes, (II-4) - Aa
c) probability of the another child :
Autosomal recessive: Aa x aa 50%
Autosomal dominant: aa x Aa 50%
Explanation:
a) Marfan syndrome could be inherited by the autosomal recessive or dominant pattern on the basis of following characters according the pedigree gives:
- transmitted by anyone regardless of sex male or female
- characters should not skip generations
- A cross between affected person and an normal person should produce approximately half of the affected offspring.
b) Assuming that autosomal dominant than there is two possibilities :
1) in case of I 2 genotype is heterozygous which means it is Aa which will produce Aa Aa aa and aa with crossing with aa as per pedigree however it is incorrect according the offspring given in II.
2) If I 2 is AA- then offspring will be Aa, Aa, Aa and Aa. which is correct according the pedigree.
thus, the answer is - Aa
c) the punnet square as per question is :
II2 - Aa × II1 - aa
A a
a Aa aa
a Aa aa
similar with autosomal recessive
thus, the correct answer is 2 out of 4 that is 50%
describe the process involved when the human eye views an object
Answer:
How the eye view an object.
As the object appear before the eye,
Light enter the cornea, the domeshape that cover the front eye.
The light then enter the pupil through the cornea.
The light then hit the eye lens, a transparent structure that focuses the light through the virteous humour, a gel like substance that surrond the retina.
The retina then receive the light that was focused by the eyes lens and transform it to electrical impulses.
The electrical impulses is then transmitted to the person through the optic nerve,
The optic nerve then interpret it as the object view.
Explanation.
Eyes are organs of the visual system. They provide both humans and animals with the ability to receive and process visual information, thereby enabling different photo response functions that are independent of vision. Eyes detect light and convert it to electrical impulses in neurons. The optic nerve then send it to the brain which is then is interpreted as what is seen.
How the eye view an object.
As the object appear before the eye,
Light enter the cornea, the domeshape that cover the front eye.
The light then enter the pupil through the cornea.
The light then hit the eye lens, a transparent structure that focuses the light through the virteous humour, a gel like substance that surrond the retina.
The retina then receive the light that was focused by the eyes lens and transform it to electrical impulses.
The electrical impulses is then transmitted to the person through the optic nerve,
The optic nerve then interpret it as the object view.
Scientists use existing fossils to predict what the transitional forms between organisms might look like. Why might it be so hard for scientists to find fossils of these transitional forms
Answer:
Any preserved remains, trace, or impression of any once-thriving living thing from the past geological age is known as a fossil. This comprises exoskeletons, bones, stone imprints of animals or microbes, shells, hair, petrified wood, objects preserved in amber, DNA remnants, coal, and oil. The fossil record is the term used for the totality of fossils.
The scientists use the prevailing fossils to show what the intermediary forms between the organisms may appear like. It is hard for the scientists to locate the fossils of the transitional forms as the formation of the fossils of the transitional forms may have never taken place because of the environmental conditions. In case if they did have formed, then the natural procedures like erosion may have demolished them.
Select the correct answer.
Which statement best compares the role of meiosis in a unicellular and a multicellular organisms?
OA.
Meiosis is the mechanism used for producing somatic cells in unicellular as well as multicellular
OB.
Meiosis is the mechanism used for producing gametes in unicellular organisms and somatic cells
O c.
Meiosis is the mechanism used for producing gametes in multicellular organisms whereas it doe
unicellular organisms.
Reset
Next
Answer:
Meiosis is the mechanism used for producing gametes in multicellular organisms whereas it does
unicellular organisms.
Explanation:
Meiosis is a kind of cell division used mainly by sexually-reproducing organisms, whether unicellular or multicellular, to produce gametes i.e. meiosis only occurs during gamete formation.
In sexual reproduction, gametes must fuse in a process called fertilization. This gametes, however, must each possess half of the chromosome number of the individual organism. Meiosis is the process that ensures that the chromosome number of the gametes is reduced by half i.e. diploid (2n) to haploid (n).
Therefore, meiosis is the process of gamete formation in sexually-reproducing unicellular or multicellular organisms.
Pine trees that are too tall or too short do not do as well as pine trees that are average in height. The short trees do not get as much light as tall or average trees. The tall trees are more likely to break off in storms. Tell how this is an example of stabilizing selection. Be sure to define stabilizing selection in your answer.
Answer:
Median height is selected
Explanation:
Stabilizing selection is a particular type of natural selection where the mean of the trait in the population stabilizes on non-extreme phenotypes, thereby favoring intermediate phenotypic variants. At genetic level, stabilizing selection is shaped by selective forces that push the distribution of the trait in the population toward the average (median trait), it is a condition that may happen when a population is completely adapted to its environment. Thus, stabilizing selection acts to purge the extreme phenotypic variants via purifying selection. Stabilizing selection is considered to be one of the most important mechanisms controlling the distribution of different phenotypes after many cycles of artificial selection, it s for that reason that breeders believe that this type of natural selection is the most common in nature.
Two students performed the same experiment, testing how far iodine will diffuse through starchy tissue, such as potatoes. They cut 5 potato squares each, all of equal sizes, and placed them into small cups with iodine solution for 15 minutes. Then they measured how far from the edge of the potato the iodine diffused into the potatoes, in millimeters.
Distance Diffused (mm)
Trial 1 Trial 2 Trial 3 Trial 4 Trial 5
Student 1 3.25 3.17 3.26 3.64 3.44
Student 2 3.14 3.43 3.22 3.37 3.28
1. What is the range of student 1's results?
a. 3.35
b. 0 29
c. 0 47
d. 3 29
2. Why do scientists conduct experiments?
a. To test their results.
b. To test a hypothesis.
c. To test a conclusion.
d. To explain an observation.
Answer:
Option c
Option b
Explanation:
To calculate range: range is highest data value - lowest data value
where the highest value in student 1's result is 3.64 and the lowest value is 3.17
Thus, the range of student 1's result is
3.64 - 3.17 = 0.47
Scientists conduct experiments to test a hypothesis. For a scientific research, the researcher first form hypotheses on a particular question she wants answered or maybe she is curious about something. An experiment is then carried out to further test the validity of the hypothesis so as to be able to make a conclusion.
Answer:
A
Explanation:
bc
Angiosperms (flowering plants) and vertebrates obtain nutrients from their environment in different ways. a. Discuss the type of nutrition and the nutritional requirements of angiosperms and vertebrates. b. Describe 2 structural adaptations in angiosperms for obtaining nutrients from the environment. Relate structure to function. c. Interdependence in nature is evident in symbiosis. Explain two symbiotic relationships that aid in nutrient uptake, using examples from angiosperms and/or vertebrates. (Both examples may be angiosperms, both may be vertebrates, or one may be from each group.)
Answer:
a. Angiosperm are plants (autotrophs) that use photosynthesis to produce their own food, while vertebrates are animals (heterotrophs) that obtain their food from other organisms. Vertebrates include fish, amphibians, reptiles, mammals and birds.
b. Adaptations in angiosperms include two reproductive structures 1- fruits (ovaries), whose main function is to disperse the seeds and 2- flowers that ensure pollination and protect the embryo sac during its formation.
c . Examples:
1- The mycorrhizal symbiosis between plant roots and symbiotic fungi plays a key role in nutrient uptake from the soil. Arbuscular mycorrhizal is a type of symbiosis where a fungus of the phylum Glomeromycota penetrates the cortical root cells of vascular plants to produce specialized structures named arbuscules.
2- Microflora in the vertebrate digestive tract. The microorganisms that live in the digestive tract of vertebrate species are beneficial for the absorption of nutrients. For example, in humans, Saccharomyces boulardii has shown to have a probiotic effect by increasing intestinal homeostasis, thereby enhancing nutrient uptake.
______ is a section of DNA that is required to make a protein. The section of DNA undergoes_______ in order to synthesize a protein. As amino acids are put together, their ______determines the way in which they will fold into a three-dimensional structure. It is the________ of the folded structure that determines its function.
A sequence is a section of DNA that is required to make a protein. The section of DNA undergoes transcription in order to synthesize a protein. As amino acids are put together, their order determines the way in which they will fold into a three-dimensional structure. It is the shape of the folded structure that determines its function.
Gene is a section of DNA that is required to make a protein. The section of DNA undergoes translation in order to synthesize a protein. As amino acids are put together, their sequence determines the way in which they will fold into a three-dimensional structure.
What is a gene?A gene is a segment of DNA that is required to produce one protein. Because they code for proteins made up of hundreds or thousands of amino acids, genes are typically hundreds or thousands of base pairs long.
Translation is the process by which ribosomes in the cytoplasm or endoplasmic reticulum synthesize proteins in molecular biology and genetics.
The amino acid sequence of a protein drives the folding and intramolecular bonding of the linear amino acid chain, that will determines the protein's unique three-dimensional structure.
The folded structure's conformation determines its function, which is directly dependent on the protein's linear amino acid sequence.
Thus, it can be concluded that, section of DNA referred to as gene is involved in protein synthesis, i.e., translation. In this amino acid sequence will decide the type of fold.
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Mary and Jim used a streak plate to test pieces of the rock. They compared their results to a streak of limonite:
limonite
Mary and Jim's sample
What do you notice? What can you conclude from the test?
Answer:
The streak colors are different. Limonite streaks show yellow.
Explanation:
The minerals in the rocks they found are not limonite
According to Mary and Jim. The colors of the streaks are different. This is because every piece of rock has different origins and with respect to that, they obtain colors.
What is Limonite?Limonite may be defined as iron ore that possesses a brown earth pigment. In ancient times, it was utilized as an ornamental stone for small carved items such as beads and seals. It is also known as brown hematite or brown iron ore.
The limonite generally occurs in the cavity of sedimentary rocks as well as its coating. It also presents as iron rust. This experiment clearly demonstrates the different colors of the streak.
The ores of limonite are yellowish in color and consist of 40 to 60% of iron metal. The colors of other ores are significantly different from the streak of limonite.
Therefore, the colors of the streaks are different. This is because every piece of rock has different origins and with respect to that, they obtain colors.
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What system is identified by the movement of carbon through life forms in the Earth’s biosphere? a. Slow carbon cycle b. Fast carbon cycle c. Photosynthesis d. Carbon cycle
B. Fast Carbon Cycle moves through life forms on earth
Answer:
the answer above is correct
An example of genetic recombination is shown in the diagram. An example of genetic recombination is shown. 2 cells are connected but each have their own D N A. A structure is stretching from one cell to another. Which type of bacterial reproduction is depicted in the diagram? binary fission transduction conjugation transformation
Digram is not given in the question, so, the required diagram is attached below:
Answer:
conjugation
Explanation:
Conjugation is defined as a sexual process in which two organisms of the same species share their nuclear material or DNA with each other and form a new organism.
Binary Fission is defined as the process in which one organism divides into two daughter cells to form a new organism.
Transduction is the process in which a foreign DNA is transferred into a cell with the help of a vector.
Transformation is the process of genetic alteration in which a cell acquires genetic material from its surroundings.
Hence, the diagram is showing the process of "conjugation".
Answer:
the answer is C-conjugation
Explanation:
What is a cell and what are the function of each
Cells are the basic building blocks of all living things. The human body is composed of trillions of cells. They provide structure for the body, take in nutrients from food, convert those nutrients into energy, and carry out specialized functions.
Hope this helps
-lvr
Which rock is an example of an organic sedimentary rock?
O iron ore
O rock salt
O limestone
O sandstone
Answer:
Hello Again!!
Your answer is C. LIMESTONE!
Explanation:
Limestone is formed Calcium Carbonate (CaCO3) and a mixture of othe organic matters like shells, coral and waste...
HOPE THIS HELPS!
itsMATT04
Limestone is an example of an organic sedimentary rock.
What is organic sedimentary rock?These are organic-rich sedimentary rock which contains significant amount of organic carbon.
Limestone chemically is calcium carbonate, which contains organic carbon.Rock salt is an inorganic sedimentary rock.Sand stone is a clastic sedimentary rock which is formed by the compact sand granules.Iron ore is a source of minerals and iron.Hence, here limestone is the only organic sedimentary rock.
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Asthma is a restrictive lung disorder that causes constriction and congestion of the pulmonary bronchioles. How would an asthma attack affect FVC?
Answer:
Explanation:
This includes a decrease in the rate of maximal expiratory air flow (a decrease in FEV1 and the FEV1/FVC ratio) due to the increased resistance, and a reduction in forced vital capacity (FVC) correlating with the level of hyperinflation of the lungs.