COMPREHENSION QUESTIONS

Section 4.1

Question 1

*1.How does sex determination in the XX-XY system differ from sex determination in the ZZ-ZW system?

Question 2

2.What is meant by genic sex determination?

Question 3

3.How is sex determined in humans?

Section 4.2

Question 4

4.What characteristics are exhibited by an X-linked trait?

Question 5

5.Explain why tortoiseshell cats are almost always female and why they have a patchy distribution of orange and black fur.

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Question 6

6.What is a Barr body? How is it related to the Lyon hypothesis?

Section 4.3

Question 7

7.How do incomplete dominance and codominance differ?

Question 8

8.What is incomplete penetrance and what causes it?

Section 4.4

Question 9

9.What is gene interaction? What is the difference between an epistatic gene and a hypostatic gene?

Question 10

10.What is a complementation test and what is it used for?

Section 4.5

Question 11

11.What characteristics are exhibited by a cytoplasmically inherited trait?

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