Mutation causes a defect in one of the three enzyme that processes pyruvate
<span>D) The frequency of the strong-beak alleles increased in each bird as the drought persisted.</span>
Each gamete gets just one crest allele. Half of the gametes will get one of the parent's alleles, and the other half will get the other allele. The Punnett square shows the possible crest allele combinations in the offspring. There are 4 possible combinations in all.
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