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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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beast2animal beast2animal
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9 years ago
 A dominant gene, A, causes yellow color in rats. The dominant gene for another independent gene, R, produces black coat color. When the two dominants occur together,
A_R_, they interact to produce gray. Rats of the genotype aarr are creamed color. If a gray male and a yellow female when mated produce offspring approximately 3/8 of which are yellow, 3/8 gray, 1/8 cream, and 1/8 black, what are the genotypes of the two parents?
tyvm for helping me!
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Educator
9 years ago
Try this Smiling Face with Open Mouth
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#2
9 years ago
A = yellow
R = black
Interaction between A and R produce gray

Genotypes of the parents:
Female: yellow (Aarr)
Male: gray (AaRr)

P: Yellow (Aarr) >< Grey (AaRr)
Gametes: (Ar, ar) >< (AR, Ar, aR, ar)
F1 (Punnet square)
----|----- AR ------|------- Ar ------|------ aR -----|----- ar
Ar | AARr (gray) | AArr (yellow) | AaRr (gray) | Aarr (yellow)
ar | AaRr (gray) | Aarr (yellow) | aaRr (black) | aarr (cream)

Ratio: 3/8 yellow : 3/8 gray : 1/8 cream : 1/8 black
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