Lisa, a 35-year-old mother of two, presents to a family practitioner's office in Maine. She is visibly shaken, but does not appear to be acutely ill in any way. You begin to take her vitals, and suddenly she shouts out: "Please, just take this from me!" You reach for the sandwich bag in her hand, which appears to contain a fecal sample. Upon closer inspection, you notice something in the sample that makes you quickly understand the woman's agitation.

Humans are believed to have evolved in coastal regions in east africa. the region had an abundant supply of fish for early humanoids to eat. when scientists analyze the fads gene they see an interesting pattern. people whose families have lived in this area of east africa for generation show a high level of diversity in alleles for the fads gene. conversely, people whose families had migrated inland a moderate distance from sources of fish showed a much lower diversity for fads gene alleles. additionally, the fads alleles found in people whose family has lived inland for generation are almost all gene alleles which produce fads proteins with a high level of function and activity. how do anthropologists explain this?