Question

in rabbits, black fur (b) is dominant over brown fur (b). consider the following cross betwe two rabbits.
bb x bb
refer to the illustration above. the genotypic ratio of the f₁ generation would be
1:2:1.
1:1.
3:1.
1:3.

Explanation:

Step1: Fill the Punnett Square

For the cross \( Bb \times Bb \), we fill each cell:

• Cell 1 (B from top and B from left): \( BB \)
• Cell 2 (b from top and B from left): \( Bb \)
• Cell 3 (B from top and b from left): \( Bb \)
• Cell 4 (b from top and b from left): \( bb \)

Step2: Count Genotypes

Count the number of each genotype:

• \( BB \): 1
• \( Bb \): 2
• \( bb \): 1

Step3: Determine Genotypic Ratio

The ratio of \( BB:Bb:bb \) is \( 1:2:1 \).

Answer:

1:2:1