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In dogs, straight tail results from an allele (Ta) which is dominant to allele (ta) for...

In dogs, straight tail results from an allele (Ta) which is dominant to allele (ta) for curved tail. Large paws result from an independently assorting allele (P) which is dominant to an allele for small paws (p). Small pawed dog homozygous to straight tail is crossed with a homozygous large pawed dog with curved tail. All the F1 pups have large paws and straight tails.

An F1 dog is crossed with a stray dog that has small paws and curved tail. What phenotypes and proportions of progeny are expected from this cross?

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Answer #1

The genotype of dog with small paws and homozygous for straight tail = ppTaTa

The genotype of dog with homozygous large paws and curved tail = PPtata

Cross -----------------> ppTaTa x PPtata

gametes ---------------> pTa Pta

F1----------------------------------> PpTata

(Large paws and straight tail)

Now:

   PpTata x pptata (Small paws and curved tail)

Gametes -------------------> PTa Pta pTa pta pta

PTa Pta pTa pta
pta

PpTata

(Large paws straight tail)

Pptata

(Large paws curved tail)

ppTata

(Small paws Straight tail)

pptata

(Small paws curved tail)

The proportion of Large paws straight tail is 1/4 = 0.25 or 25%

The proportion of Large paws curved tail is 1/4 = 0.25 or 25%

The proportion of Small paws straight tail is 1/4 = 0.25 or 25%

The proportion of Small paws curved tail is 1/4 = 0.25 or 25%

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