Question

in a group of channel catfish, some individuals have a brown body and others have a white body. in this group, the gene for the body color trait has two alleles. the allele for a white body (b) is recessive to the allele for a brown body (b). this punnett square shows a cross between two channel catfish. punnett square with rows b, b and columns b, b; cells bb, bb, bb, bb what is the probability that a channel catfish produced by this cross will be homozygous recessive for the body color gene? %

Explanation:

Step1: Identify total outcomes

The Punnett square has 4 cells (BB, Bb, Bb, bb), so total possible genotypes are 4.

Step2: Identify homozygous recessive

Homozygous recessive for body color (white body) is \( bb \). From the Punnett square, \( bb \) appears 1 time.

Step3: Calculate probability

Probability = (Number of \( bb \) outcomes) / (Total outcomes) = \( \frac{1}{4} \). Convert to percentage: \( \frac{1}{4} \times 100 = 25\% \).

Answer:

25