Question

1. Color of chickens is determined by interacting loci: AA or Aa give white, aaBB or aaBb give colored, and aabb produces white. What are the phenotypic frequencies of the offspring from a cross between two fully heterozygous chickens?

Group of answer choice

15 white : 1 colored

13 white : 3 colored

12 white : 4 colored

9 white : 7 colored

none of the above

2. The color of chickens is determined by interacting loci: AA or Aa give white, aaBB or aaBb give colored, and aabb produces white. Describes the epistatic interactions occuring between these two genes?

Group of answer choices

aa is epistatic to B_, bb and B_ is epistatic to A_, aa

aa is epistatic to B_, bb and bb is epistatic to A_, aa

A_ is epistatic to B_, bb and B_ is epistatic to A_, aa

A_ is epistatic to B_, bb and bb is epistatic to A_, aa

none of the above

Answer 1

1.

Frequency of white phenotype = 13/16×100 = 81.25%

Frequency of colored phenotype =3/16×100=18.75%

The group of answer choice is 13white : 3 colored

2.

Epistatic interactions occurs when two or more different gene influences the outcome of a single trait. Epistasis is a phenomenon where the presence of one gene changes the effects of another gene.

The presence of the dominant allele (A) of "A" gene suppresses the effects of both the allele of "B" gene. So it is dominant epistasis.

A gene is called as epistatic when its presence suppresses the effects of another gene in another locus.

None of the aboveoptions are correct.

Here, A_ is epistatic to B_,bb and B_ is epistatic to aa.