Question

iguanas are living in a relatively dry habitat. imagine a change in the iguana’s habitat from dry land to aquatic. based on the generation i allelic frequencies, we can assume only a small percentage of iguanas had webbed feet. predict what should happen to the allelic frequencies within the iguana population over time.
a the heterozygous genotype will eventually increase to 100% in the gene pool.
b the dominant and recessive alleles will eventually balance out in the population.
c the dominant allele will decrease while the recessive will increase in the gene pool.
d the recessive allele will begin to mask the effects of the dominant allele over time.

Explanation:

Webbed feet are adaptive in aquatic habitats, so iguanas with webbed feet (likely carrying the allele for this trait) will have higher survival/reproduction rates. This natural selection increases the frequency of the allele for webbed feet over time. Assuming the webbed feet allele was rare (recessive, as only a small percentage had it initially), its frequency rises while the non-webbed (dominant) allele frequency falls.

Answer:

C. The dominant allele will decrease while the recessive will increase in the gene pool.