RRPP walnut RRPp walnut RrPP walnut RrPp Walnut RRpp rose Rrpp rose rrPP pea rrP

ID: 80228 • Letter: R

Question

RRPP walnut RRPp walnut RrPP walnut RrPp Walnut

RRpp rose Rrpp rose

rrPP pea rrPp pea

rrpp single

1. Concerning comb shape in chickens, which of the following is true?

a. The R and P are codominant and produces a walnut comb

b. P is recessive to p and produces a single comb

c. R is recessive to r and produces a rose comb

d. The R gene is dominant to the P gene

2. Which is the most complete and accurate definition of epistasis?

a. An inheritance pattern where two genes affect a single trait

b. An inheritance pattern where the observed genotypic ratios differ from expected ratios

c. An inheritance pattern in which the alleles of one gene mask the phenotypic effects of different gene

d. An inheritance pattern where a 9:3:3:1 ration is found in the F2 generation

1.The correct answer is:a.The R and P are codominant and produces a walnut comb.

Reason:The above statement of all the statements is true as walnit comb is due to presence of both R and P genes.

2.The correct answer is: c.An inheritance pattern in which the alleles of one gene mask the phenotypic effects of different gene.

Reason: In epistatis, one gene suppresses the effect of the other gene.

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