Question

In mussels, brown coloring (b) is dominant, and blue coloring (b) is recessive. a homozygous brown mussel crosses with a blue mussel. what percentage of offspring are expected to be blue?

o 50%
o 25%
o 75%
o 0%
o 100%

Answer 1

When a homozygous dominant brown mussel crosses with a homozygous recessive blue mussel, 0% of the offspring are expected to be blue, as all will inherit the dominant allele for brown coloring. Answer is D.

Step-by-step explanation:

Answer is D. The question refers to a genetic cross involving mussels with different color traits, where brown coloring (represented by the allele 'b') is dominant over blue coloring (also represented by 'b', but should be 'B' for clarity as dominants are typically denoted by uppercase letters). When a homozygous dominant brown mussel (BB) crosses with a homozygous recessive blue mussel (bb), all of the offspring will be heterozygous (Bb) and display the dominant brown coloring. Therefore, the percentage of offspring that are expected to be blue is 0%, because blue is a recessive trait and there are no alleles for blue coloring in the dominant parent to pass on.