Question

It’s estimated that about 2.5% of Caucasians carry the gene for cystic fibrosis. This is an example of .

allele frequency

gene flow

lateral gene transfer

variation

Answer 1

allele frequency

Explanation: saying 2.5% of a population carry a particular gene states the frequency of that allele in the population. Gene flow and lateral (horizontal) gene transfer refer to movement of genes between populations or organisms; "variation" is too general.