Question

In cattle, the polled (P) or hornless condition is dominant to the horned condition (p). A...

In cattle, the polled (P) or hornless condition is dominant to the horned condition (p). A certain bull was mated to 3 different cows. The first cow was horned (pp) and had a polled calf. The second cow was horned and had a horned calf. The third cow was polled (P) and had a horned

a. What is the genotype of the first cow?

b. What is the genotype of the first calf?

c. What is the genotype of the bull?

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Homework Answers

Answer #1

P (being hornless) is dominant over p (horned)

So, PP, Pp - hornless

pp - horned

The first and second cow, both were horned (pp) but first had hornless calf (P_) and the second had horned calf (pp), that means the bull is heterozygous (Pp)

The third cow was polled (P_) and had a horned calf (pp)

Genotype of first cow - pp , and it's calf - Pp

Genotype of second cow - pp , and it's calf - pp

Genotype of third cow- Pp , and it's calf - pp

Genotype of the bull - Pp

a. pp

b. Pp

c. Pp

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