Thank you ptx .09 MB) Page iclicker? A breed of dog has a hypostatic gene for co

Question

Thank you ptx .09 MB) Page iclicker? A breed of dog has a hypostatic gene for coat color that comes in 2 alleles, B-black and b-tan. If there is a recessively epistatic 2nd gene (E) that creates an all white dog, what coat colors would you expect in litter from a dog that is heterozygous for both genes and a homozygous recessive for the hypostatic gene/white dog? A. All white puppies B. All black puppies C. 50% black and 50% tan puppies D. 25% black, 25% tan and 50% white puppies E. 50% tan and 50% white puppies

Explanation / Answer

ANSWER:

Epistasis is the effect that masks or modify the effect of another causing phenotypic variations.

recessive epistasis is in the ratio of 9:3:4 (dominant both: dominant epistatic, recessive other:recessive epistatic)

recessive epistasis suppresses the effect of non allelic gene in homozygous reccessive state.

in my opinion it will be 50% black and 50% tan puppies.

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