What is the genotypic ratio of the offspring of two parents who do not show any signs of the deafness but are carriers (Dd)?
Ans: 1:2:1
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A friend tells you the following story. "My aunt just received a heart transplant. Her doctors warned us that her body might reject the tissue. I just can't understand how that could happen as human hearts are made of the same tissues, aren't they?" How do you respond?
A. "Yes, all human hearts are made of cardiac muscles." B. "Yes, all human hearts are made of cardiac muscles, except some humans have different tissues inside their hearts and this could lead to a tissue rejection by the recipient." C. "Yes, all human hearts are made of cardiac muscles. As far as the rejection of tissues goes, your aunt might have different antibodies than did the donor, which could lead to a rejection." D. "Yes, all human hearts are made of cardiac muscles. However, your aunt might have been given some type of drug during the transplant operation that might cause tissue rejection. You can never be too careful in a hospital, you know." E. "Yes, all human hearts are made of cardiac muscles. As far as the rejection issue, everyone has different MHC proteins on their tissues. Your aunt's immune system recognizes the ‘self' tissues but can cause tissue rejection because of the ‘nonself' tissue in her body having different MHC proteins." Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about tissues and transplants? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
How does the large amount of genetic variation observed in prokaryotes arise?
A.) The mutation rate in prokaryotes is much higher than in eukaryotes. B.) They have extremely short generation times and large populations. C.) They can exchange DNA with many types of prokaryotes by way of horizontal gene transfer. D.) They have a relatively small genome. E.) The second and third answers are correct.
Which of the following is a compartment that often takes up much of the volume of a plant cell?
a) peroxisome b) vacuole c) lysosome d) mitochondrion e) Golgi apparatus
Choanoflagellates are most closely related to the ____.
A. land plants B. animals C. mold D. bacteria E. slime molds