Ch 4 Epistasis - Exam Two!

Question 1

Define epistasis

Answer 1

masking or alteration of the gene expression of the alleles of one gene by allelic combinations of another

Question 2

What are the five types of epistasis?

Answer 2

Recessive
Dominant
Complementation
Duplicate Gene Action
Suppression

Question 3

What is the ratio for recessive epistasis?

Answer 3

9:3:4

Question 4

What is the ratio for dominant epistasis?

Answer 4

12:3:1

Question 5

What is the ratio for complementation epistasis?

Answer 5

9:7

Question 6

What is the ratio for duplicate gene action epistasis?

Answer 6

15:1

Question 7

What is the ratio for suppression epistasis?

Answer 7

13:3
(C-I- = white
C-ii = colored
ccI- = colored
ccii = colored)

Question 8

What is the difference between sex influenced and sex limited genes?

Answer 8

limited is only in one sex
influenced is heavily swayed by sex

Question 9

What is a sex linked gene?

Answer 9

A gene found on a sex chromosome

Question 10

What is an example of a sex-limited gene?

Answer 10

Hen feathering

Question 11

What is an example of a sex influenced gene?

Answer 11

pattern type baldness