Two gene loci, A and B, are unlinked, with alleles A and B dominant over alleles

Question

Two gene loci, A and B, are unlinked, with alleles A and B dominant over alleles a and b. Indicate the probabilities of producing the following. a. An Ab gamete from an AaBb individual? b. An Ab gamete from an AABb individual? c. An AaBb offspring from a cross AaBb times AABB? You cross two bunnies which were heterozygous for the two genes that control bunny color, BbHh, and you obtain the following progeny: 9 brown bunnies, 3 yellow bunnies, and 4 white bunnies. You think that this result indicates that bunny color is controlled by epistasis. What is epistasis and how would it give these results? In humans, color blindness X^b, is an X-linked recessive trait. A woman that is heterozygous for normal vision marries a color blind man What are the genotypes of each of the parents?

Explanation / Answer

(1)

(a).Probability of Ab gamete from AaBb =¼

(b) Probability of Ab gamete from AABb =½

(c)Probability of AaBb offspring= ½ x ½ = ¼

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