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In a population of cows, some individuals have a black coat and others have a red coat. The gene for coat color has two possible alleles. One allele is for a black coat (B), and the other allele is for a red coat (b).Consider a cross between two cows. Both cows are heterozygous for the coat color gene (Bb).Which Punnett square correctly models the results of this cross?Choose 1 answer:Choose 1 answer:(Choice A)   A(Choice B)   B(Choice C)   C

Question

In a population of cows, some individuals have a black coat and others have a red coat. The gene for coat color has two possible alleles. One allele is for a black coat (B), and the other allele is for a red coat (b).Consider a cross between two cows. Both cows are heterozygous for the coat color gene (Bb).Which Punnett square correctly models the results of this cross?Choose 1 answer:Choose 1 answer:(Choice A)   A(Choice B)   B(Choice C)   C

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Solution

To determine the correct Punnett square for a cross between two heterozygous cows (Bb), we need to set up the square and fill in the possible combinations of alleles from each parent.

  1. Write the alleles of each parent along the top and side of the Punnett square. Since both parents are heterozygous (Bb), the alleles will be B and b for both.
     B   b
   --------
B |    |    |
   --------
b |    |    |
   --------
  1. Fill in the squares by combining the alleles from the top and side.
     B   b
   --------
B | BB | Bb |
   --------
b | Bb | bb |
   --------
  1. The completed Punnett square shows the possible genotypes of the offspring:
    • BB (Black coat)
    • Bb (Black coat, since B is dominant)
    • Bb (Black coat, since B is dominant)
    • bb (Red coat)

So, the correct Punnett square is:

     B   b
   --------
B | BB | Bb |
   --------
b | Bb | bb |
   --------

Now, match this with the given choices (A, B, C) to find the correct one.

This problem has been solved

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