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?

100% of the offspring are blue butterflies.

Explanation:

B is a dominant allele, determining the blue color of a butterfly.

b is a recessive allele. This means a bird with bb genotype is yellow in color.

A pure blue butterfly (BB) produces only B gametes, and a pure yellow butterfly (bb) gives onl b gametes.

Therefore, the offspring in the BB x bb cross are all blue in color.

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