A cow that is heterzygous for the black coat allele is crossed with a bull that is homozygous for the red coat allele. Which of the following Punnett squares represents this cross?

A. B B
b Bb Bb
b Bb Bb That's one punnett square

B. B b
B BB Bb
b Bb bb That's one punnett square

C. B b
b Bb bb
b Bb bb That's one punnett square

D. B b
B BB Bb
B BB Bb That's one punnett square
Is the answer c?

The answer is C

Yes, the answer is C.

In this cross, the cow that is heterozygous for the black coat allele (Bb) is crossed with a bull that is homozygous for the red coat allele (bb). The Punnett square for this cross would show the possible combinations of alleles that the offspring can inherit from their parents.

In option C, the Punnett square shows that there is a 50% chance for the offspring to inherit the black coat allele (Bb) and a 50% chance to inherit the red coat allele (bb), which correctly represents this cross.

To determine the Punnett square representing the cross between a heterozygous black coat cow and a homozygous red coat bull, we need to understand the inheritance of coat color in cows.

Coat color in cows is controlled by a single gene with two alleles: B (black coat) and b (red coat). The B allele is dominant over the b allele. A heterozygous cow, which carries one copy of each allele (Bb), will have a black coat since the black allele is dominant.

In this case, the cow that is heterozygous for the black coat allele (Bb) is crossed with a bull that is homozygous for the red coat allele (bb).

Now, let's consider the Punnett square options provided:

A. B B
b Bb Bb
b Bb Bb

B. B b
B BB Bb
b Bb bb

C. B b
b Bb bb
b Bb bb

D. B b
B BB Bb
B BB Bb

The correct Punnett square must represent the combination of the cow's alleles (Bb) with the bull's alleles (bb), where the dominant allele B is paired with the recessive allele b.

Looking at the options, we find that option C (B b, b Bb bb, b Bb bb) correctly represents the cross between a heterozygous black coat cow and a homozygous red coat bull. In this Punnett square, the offspring will inherit one copy of the black coat allele (B) and one copy of the red coat allele (b), resulting in a black coat.

Therefore, the correct answer is C.

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