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.

Question

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

___________ ____________
____ ____offspring 1 ____offspring 2
____ ___offspring 3 ____offspring 4
___% Black

___% White

Answer 1

To determine the possible genotypes and phenotypes of the offspring from a cross between a BB male rabbit and a Bb female rabbit, we can set up a Punnett square.

Parent Genotypes

• Male Rabbit (BB)
• Female Rabbit (Bb)

Punnett Square

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

Offspring Genotypes

From the Punnett square, we can see the following possible genotypes for the offspring:

1. BB
2. BB
3. Bb
4. Bb

Genotype Distribution

• 2 BB (homozygous dominant)
• 2 Bb (heterozygous)

Phenotype Distribution

Since black fur (B) is dominant over white fur (b), all offspring with genotype BB or Bb will display the black fur phenotype.

Percentages

• Percentage of Black Offspring:

  • BB: 2 (50%)
  • Bb: 2 (50%)
  • Total Black Offspring = 100%

• Percentage of White Offspring:

  • There are no bb offspring (0%)
  • Total White Offspring = 0%

Summary

• Genotypes:

  • Offspring 1: BB
  • Offspring 2: BB
  • Offspring 3: Bb
  • Offspring 4: Bb

• Percentage of Offspring:

  • 100% Black
  • 0% White