Question

A population of rabbits follows the typical pattern of inheritance and the law of dominance for fur color. B is the allele for black fur and b is the allele for white fur. In a population of rabbits, 120 bunnies are born. How many bunnies should be black, according to the Punnett square?
Responses

A 6060

B 8585

C 9090

D 100

Answer 1

To determine how many bunnies would be black, we need to know the genotypes of the parent rabbits. Assuming a typical Mendelian inheritance pattern, we can use a Punnett square to predict the offspring's phenotypes.

If we consider the common scenarios:

1. **Both parents are homozygous recessive (bb)**: All offspring (100%) will be white (bb).
2. **One parent is homozygous dominant (BB) and the other is homozygous recessive (bb)**: All offspring (100%) will be black (Bb).
3. **Both parents are heterozygous (Bb)**:
- The Punnett square would show:
- 1 BB (black)
- 2 Bb (black)
- 1 bb (white)
- This would produce 75% black (BB and Bb) and 25% white (bb).

Without specific information about the genotypes of the parents, we cannot provide an exact answer. However, a commonly used scenario is when the parents are both heterozygous (Bb), resulting in 75% of the offspring being black.

If we apply this typical ratio of 3:1 (75% black and 25% white) to the 120 bunnies:

- Black bunnies = \( 120 \times \frac{3}{4} = 90 \)

So the correct answer would be:

**C. 90**