Question

Hairlessness in American rat terriers is recessive to the presence of hair. Suppose that you have...

Hairlessness in American rat terriers is recessive to the presence of hair. Suppose that you have a rat terrier with hair. Represent the hairless allele with h and the allele for the hairy trait with H.

How can you determine whether your dog is homozygous (HH) or heterozygous (Hh) for the hairy trait? Why?

a) cross with a hairy rat terrier

b) cross with a hairless rat terrier

c) cross with a hairless rat terrier, then backcross any hairless progeny with your dog

d) cross with a hairy rat terrier, then backcross any hairless progeny with your dog

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Answer #1

I believe the correct answer to be:

Option B) Cross with a hairless rat terrier.

As the hairless rat would be homozygous recessive (hh) genotype as hairlessness is a recessive trait and if the unknown rat is homozygous dominant (HH) for the trait, all the offsprings will have hair (Hh) but if it is heterozygous Hh, half will have hair (Hh) and half of the offsprings will be hairless (hh).

feel free to leave a comment down below for any further query. good rating would be appreciated if you find my answer helpful. thank you.

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