Recent genetic evidence suggests that the expansion of the brain might be related to __________.
A) a mutation in the muscles of the jaw
B) sexual selection for individuals with big brains
C) genetic drift between populations with big and smaller brains
D) hybridization between small-brained australopithecines and big-brained Homo

Question

Quizplus · Accepted Answer

A mutation in the muscles of the jaw, specifically the MYH16 gene, has been linked to reduced jaw muscle size, which may have allowed for the expansion of the brain in human evolution.

Recent Genetic Evidence Suggests That the Expansion of the Brain