Answer:
Alec Jeffreys and the Pitchfork murder case: the origins of DNA profiling
British geneticist Alec Jeffreys began working in 1977 on a technique that could identify individuals through samples of their DNA. In 1984, he and colleagues devised a way to use a newly discovered property of DNA, isolated areas of great variability between individuals called restriction fragment length polymorphisms (RFLP), for forensic identification—the original DNA fingerprint.
In 1986, police asked Jeffreys for help in finding a man who had raped and killed two girls. DNA tests exonerated the primary suspect. Through a genetic dragnet, police found the perpetrator, Colin Pitchfork, who gave himself away when he asked a friend for a substitute blood sample.
Within a year, genetic fingerprinting was making the unique molecular structures of victims and suspects visible in criminal investigations around the world. Today, RFLP-based DNA analysis is being supplanted by newer techniques of genetic identification.
Explanation: .
which soil layer extends underneath the sediment in the ocean?
Answer
it extends on side to sediment in the ocean so the underneath the sediment will extend
Explanation:
The sedimentary layer is the soil layer that extends underneath the sediment in the ocean.
What is sedimentary layer?
Sedimentary layers are those layers that is made up of sediments. They develop as waves wash ashore and retreat. When the wave retreats it deposits its load of suspended sediment as a layer.
So we can conclude that the sedimentary layer is the soil layer that extends underneath the sediment in the ocean.
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Students wanted to perform an experiment to mimic natural selection. They noted that small plants growing in the school garden had projections that extended from the leaves. These projections are called trichomes. They hypothesized that the trichomes protect the plant from herbivory, when herbivores eat the leaves from the plants and cause damage. The students counted the average number of trichomes per leaf and plotted this on the top graph, shown here. They then selected parent plants that had a higher than average trichome number per leaf to pollinate, creating a new generation of plants. The distribution of average trichome number for the second generation is shown in the bottom graph.
Which statements below are supported by the information shown here?
A) The trichome number is controlled by a genetic factor.
B) Directional selection occurred due to the student's experiment.
C) Herbivores can no longer consume the plants in the second generation.
D) The genotypic frequencies of the first and second generation should be identical.
E) Artificial selection can alter phenotype frequencies in as few as two generations.
Answer:
A, B, E
Explanation:
The trichome number is controlled by a genetic factor and Directional selection occurred due to the student's experiment are distribution of trichome.
What is Trichome?Trichomes are present throughout the plant kingdom and exhibit an amazing range of characteristics and shapes. On vegetative and reproductive organs, glandular trichomes grow from the epidermis.
The two types are commonly classified as secretory and non-secretory, with the former having the ability to secrete chemicals
Within a plant species, trichome morphologies and metabolic secretions are uniform, and some species have various trichome morphs on the same plant organ. While various glandular trichome morphs employ various storage techniques, the design of the morph and cavity.
Therefore, The trichome number is controlled by a genetic factor and Directional selection occurred due to the student's experiment are distribution of trichome.
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What is the difference between learned and inherited behavior? question 18 options: learned behavior is something that animals are born with. inherited behavior is taught to a newborn animal. learned behavior is something that cannot change over time. inherited behavior changes over time. learned behaviors are taught during an animal’s life span. inherited behavior is something that animals are born with. learned behavior is passed down through each generation. inherited behavior is obtained from watching other species.
The difference between learned and inherited behavior include the following:
Learned behaviors are taught during an animal’s life span. Inherited behavior is something that animals are born with.What is Behavior?This is defined as the manner in which individual acts in their environment and are of two types known as learned and inherited behavior.
Their features are appropriately shown above.
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In fruit flies, the X chromosome carrying the allele for white eyes is transferred from a male to a female of the next generation. In the next generation the X chromosome is transmitted back to a male. This is called:
While washing her hair, Olivia noticed that she was losing a lot of hair. She visited a clinic, and the physician reassured her that her hair would grow back. How do you think Olivia’s hair will grow back?
Answer:
The right option is; The hair will grow back by undergoing meiosis. Meiosis is a type of cell division in which the number of parental chromosome is reduced by half, and there is formation of four haploid daughter cells that are genetically distinct from the parent cell that produced them. Meiosis only occurs when the cell needs to reproduce and it occurs in all eukaryotic, se,xually-reproducing animals and plants.
Explanation:
Activity 2.2 comparing the two body waves
Answer:
compare two body wave
Explanation:
compare one on one body wave
Compare and contrast Mendel's laws: Law of Dominance, Law of Segregation, and the Law of Independent Assortment
Answer:
The Law of Dominance states that the dominant allele completely masks the presence of a recessive allele. The law of segregation states that the two alleles for each trait separate during the formation of gametes and that during the formation of new zygotes, the alleles will combine at random with other alleles. A parent gives only one allele to make a gene. The law of independent assortment says that the allele that a gene receives first has no bearing on the allele it will receive second.
Explanation:
2. An ecosystem contains organisms interacting with each other and their physical environment
Which of these is the best indicator of a healthy ecosystem?
Answer:
give me answer choices
Explanation:
An ecosystem contains the organisms that are interacting with each other in order to maintain a healthy environment and their physical environment. The dependency is shown in the food chain and the habitat.
What is the primary producers name in the list of ecosystem ?It is the plants that produce the food in the presence of sunlight and this solar energy via the photosynthesis makes the plants cook their food.
1. Environment involves both living organisms and the non-living physical conditions.
2. These two are inseparable and inter-related.
3. The living and physical components are linked together through nutrient cycles and energy flows.
The nutrient cycle is inter linked where the food that one is eating is the dependent on other organism. The organisms are dependent on each pother for the food and the species are inter linked with each other.
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A decrease in blood pressure, detected by the afferent arteriole, will result in vasodilation. The glomerular blood pressure and the GFR will respond by ______.
A decrease in blood pressure, detected by the afferent arteriole, will result in vasodilation. The glomerular blood pressure and the GFR will respond by decreasing.
The effects of decreased blood pressure on glomeruliThe glomerular blood pressure is the pressure used to push blood and solutes from the arterioles through the glomerular filter membrane. Therefore it is the blood pressure at the glomerular capillaries.
The glomerular filtration rate (GFR) is the rate at which blood passes through the glomeruli each minute.
The decreased blood volume with its lower blood pressure will go into the afferent arteriole and into the glomerulus, resulting in decreased GFR and glomerular blood pressure.
Therefore, decrease in blood pressure, detected by the afferent arteriole, will result in vasodilation. The glomerular blood pressure and the GFR will respond by decreasing.
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Sperm become capable of movement while in the _____. seminiferous tubules vas deferens ejaculatory ducts urethra epididymis
Sperm become capable of movement while in the epididymis. The sperm which is a male reproductive cell can further be discussed below.
Where are sperms produced in the body?The sperm is the cell of the male reproductive system which is produced in the testes.
The testicles are made up it tiny tubes called seminiferous tubules which houses germ cells that divide and change until they resemble tadpoles with a head and short tail.
They are then moved to the epididymis where their development is completed after five weeks. Active movement of the sperm in the epididymis starts after its full development.
Therefore, Sperm become capable of movement while in the epididymis.
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How are the international efforts at reducing resource and ecological depletion similar?
Answer:
International efforts to reduce resource and ecological depletion operate on a volunteer basis rather than a mandatory one.
Explanation:
This is due to the fact that nations do not have jurisdiction over each other.
The outermost structure of the bacteria cell is the __ which comes in contact with the environment
I have two guesses cell wall or capsule, I know its's one of the two but I don't know which one.
Answer:
the answer should be cell wall
She always prepared food.(Yes/No question)
Answer:
YesShe always prepared food.
During hearing, the last structure(s) to vibrate, resulting in a nerve signal to the brain, is/are the
During the hearing, the last structure to vibrate, resulting in a nerve signal to the brain, is the auditory nerve.
What do you mean by Nerve signal?The nerve signal may be defined as the conduction of impulses that runs along with a nerve fiber from the axons to reach a neighboring neuron.
The process of hearing is initiated with the external projection of the ear which is known as Pinna. Then, the vibration of the sound reaches the tympanic membrane.
Then vibrations enter to middle ear which includes three tiny bones such as malleus, incus, and stapes.
At last, the vibrations reach the inner part of the ear which is known as the Cochlea. This part of the ear surrounds by auditory nerves which play a significant role in the transmission of signals to the brain.
Therefore, during the hearing, the last structure to vibrate, resulting in a nerve signal to the brain, is the Cochlea or the auditory nerve.
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_______ flow inward to the central nervous system from sensors in the periphery, while _______ flow outward from the central nervous system to the periphery.
afferent signals flow inward to the central nervous system from sensors in the periphery, while efferent signals flow outward from the central nervous system to the periphery.
What is the reflex arc?The reflex arc refers to the sequence of events since the body receives external stimuli until it reacts to it.
In general terms,
1. a stimulus of varying nature reaches the body,
2. the peripheric nervous system -PNS- receives the stimulus and sends this information to the central nervous system -CNS-.
3. The CNS processes the information and sends another signal as a response to the stimulus.
This mechanism is known as the reflex arc, and it is composed of five elements,
- Receptors,
- Three types of neurons,
Afferent or sensorial neuronsInterneuronsEfferent or motor neurons- Effectors.
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You have touched a hot stove. Your nervous system is sensing this heat. Which root of the spinal cord is receiving this information
Sensory neuron
Hope this helps :))
The sensory neuron is the root of the spinal cord is receiving this information.
When 'You have touched a hot stove. Your nervous system is sensing this heat' then a reflex action is occur.
What is reflex action?Reflex action is the actions which are carried out without conscious thought by the brain.The reflex action occur very quickly and automatically.In reflex action stimulus is carried by sensory neuron to the spinal cord.Example of reflex action is removal of hand when it touches any hot object.Therefore , the feeling of heat is carried out to the spinal cord by the sensory neuron.
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Which waves can travel through space
Answer:
Electromagnetic waves.
2. Which of the following compounds in living things contain carbon?
a. sugars
b. starches
c. proteins
d. all of the above
Answer:
D.) All of the Above
Explanation:
Carbon is represented by the letter "C" when included in chemical formulas. All of the compounds listed contain a large quantity of carbon.
The most basic unit of sugars are glucose molecules. They have the following formula: C₆H₁₂O₆.
A basic starch molecule is represented by the formula: C₆H₁₀O₅.
Proteins, in their simplest form, have this standard structure: R-CH(NH₂)COOH.
Which of the following statements apply both to enzymes and to any other catalysts? a Their activity is stopped by high temperature. b They speed up chemical reactions. c They are proteins. d They are not used up during the reaction.
photosynthesis takes place in the ____ and releases _____
1.chloroplast, oxygen
2.mitochondria, carbon dioxide
3. chloroplast, carbon dioxide
4. mitochondria, oxygen
chloroplast, oxygen
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The organelle responsible for
capturing light energy and
converting it to chemical energy
is called the ...
A. ribosome.
B. chloroplast.
C. mitochondria.
Answer:
B. chloroplast
Explanation:
Answer:
B. chloroplast
Explanation: Chloroplasts capture light energy from the sun to produce the free energy stored in ATP and NADPH through a process called photosynthesis.
These structures contract to close a bivalve and keep its soft body safe.
Answer:
teeth and sockets or (dentition)
Explanation:
Answer:
Adductor muscles
Please help!!! 50 points!! If you're not going to actually answer, please don't say anything at all. The question is in the picture.
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Conclusion Questions
Use this information to help you answer the following questions:
The original population’s actual genotype frequencies were: SS – 0.9025, Ss – 0.095, ss – 0.0025.
Is the current population in Hardy-Weinberg equilibrium? Yes or No
Is the current population evolving? Yes or No
If the current population is evolving, what type of effect is responsible for genetic drift?
Answer:
Bottle effect
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Explanation:
Upon absorption, fat-soluble vitamins travel through the lymphatic system within ________ before entering the bloodstream. a. chylomicrons b. albumin c. cholesterol d. osteocalcin e. calbindin
Upon absorption, fat-soluble vitamins travel through the lymphatic system within chylomicrons before entering the bloodstream.
What do you mean by the Lymphatic system?The lymphatic system may be defined as the tissues and organs that deliver, store, and bear white blood cells that combat infections and other diseases.
During the process of absorption. fat-soluble vitamins packaged into the chylomicrons which are further secreted into the lymphatic system before entering the bloodstream. These vitamins get stored in the adipose tissues.
Therefore, upon absorption, fat-soluble vitamins travel through the lymphatic system within chylomicrons before entering the bloodstream.
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Click on the answers that are ways people can conserve water.
There are four correct answers.
A
Install high pressure shower heads
B
Take shorter showers
C
Turn off the faucet or tap when not in use
D
Spray down sidewalks and driveways
E
Avoid putting chemicals down sewers so that water is not contaminated
F
Install a pool and hot tub
G
Convert to more efficient irrigation methods on farms and gardens
How does the process of evolution occur in a bacteria population?
Answer:
the whole cell and its DNA is passed on to the next generation because these organisms reproduce via binary fission.
What part of a neuron cell relays signals between neurons, or from a neuron to the target tissue?.
Answer: The correct answer is axon terminal
The part of a neuron cell that relays signals between neurons, or from a neuron to the target tissue, is the synaptic terminal.
What is a synaptic terminal?The movement of membrane-bound sacs, or synaptic vesicles, toward the presynaptic membrane, is triggered by the arrival of a nerve impulse at the presynaptic terminals. These vesicles fuse with the membrane and release a chemical known as a neurotransmitter.
The nervous system's excitable neuron or nerve cell has a cell body or soma (karyon), dendrites, and an axon. Dendrites are a group of many, short filaments that are in charge of receiving signals.
Therefore, the synaptic terminal is a component of a neuron cell that transmits messages from one neuron to another or from a neuron to the intended tissue.
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Discuss what is in air pollution means
Air pollution is a mixture of solid particles and gases in the air. Car emissions, chemicals from factories, dust, pollen and mold spores may be suspended as particles. Ozone, a gas, is a major part of air pollution in cities.
After blank
occurs, the cytoplasm of the cell completes its division into two daughter cells during
a process known as blank
a. M phase; interphase
b. metaphase; prophase
C. G2 phase; telophase
d. telophase; cytokinesis
Answer:
D
Explanation:
During cytokinesis, the cytoplasm gets divided into two daughter cells
The thalamus acts as a relay station for all senses except smell. How does the location of the thalamus within the brain help with this function?.
Answer:
I'm not so sure but this is what our teacher told us.
The thalamus sorts the important information from the insignificant before sending information to the cerebral cortex of the brain.