Question

Among a species of butterflies, the color blue (B) is a dominant trait. Yellow color (b) is a recessive trait. If a pure blue butterfly (BB) mates with a pure yellow (bb), what will the offspring look like?
Responses
A They will all be blue.They will all be blue.
B They will all be yellow.They will all be yellow.
C Half will be blue and half will be yellow.Half will be blue and half will be yellow.
D About 75% will be blue and 25% will be yellow.

Answer 1

When a pure blue butterfly (BB) mates with a pure yellow butterfly (bb), all of the offspring will inherit one dominant blue allele (B) from the blue parent and one recessive yellow allele (b) from the yellow parent. This means all offspring will have the genotype Bb, which expresses the dominant blue trait.

Therefore, the correct response is:

A. They will all be blue.