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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.
Eliminate

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

If webbed feet is a recessive gene, then the change to an aquatic habitat would mean that it'd be easier for iguanas with webbed feet to move around, and harder for iguanas without it (heterozygous carriers or iguanas with the dominant alleles). Therefore, they have a better rate of survival, and the recessive gene will eventually become more prevalent because the webbed feet iguanas live long enough to breed, while many of the non webbed ones start to die out without the adaptation to help them in an aquatic environment.