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In rabbits, black fur is dominant to white fur. As a rabbit breeder, you crossed a BB male with a Bb female, please complete the Punnett square for the possible genotypes of the offspring. Then complete, the percent chance for the phenotypes of the offspring.

***Please follow all Punnett square rules to complete this question.

_____________ ____________
______ _____offspring 1 ____offspring 2
______ _____offspring 3 ____offspring 4
% Black ____

% White ____

1 answer

To complete the Punnett square and calculate the probabilities for the phenotypes of the offspring, we can start by identifying the genotypes of the parents.

  1. The male rabbit is BB (homozygous dominant).
  2. The female rabbit is Bb (heterozygous).

Constructing the Punnett Square

The Punnett square for this cross will be set up as follows:

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

Analyzing the Punnett Square

From the completed Punnett square:

  • Offspring 1: BB (Black fur)
  • Offspring 2: BB (Black fur)
  • Offspring 3: Bb (Black fur)
  • Offspring 4: Bb (Black fur)

Calculating Phenotype Percentages

Now we can calculate the percentages of the phenotypes of the offspring:

  • Total offspring: 4
  • Black fur offspring: 4 (2 BB + 2 Bb)
  • White fur offspring: 0

Percentages:

  • % Black = (Number of Black Offspring / Total Offspring) * 100

    • % Black = (4 / 4) * 100 = 100%

  • % White = (Number of White Offspring / Total Offspring) * 100

    • % White = (0 / 4) * 100 = 0%

Final Summary:

% Black: 100%
% White: 0%