In humans, a dominant allele controls the formation of a cleft chin, a Y-shaped fissure in the chin caused by an atypical bone formation in the mandible (this phenotype
is also known as a chin dimple). A survey of 1200 college students found that
108 of them did not have a cleft chin. What was the frequency of heterozygotes in
that student population?

Which of the following best describes the expensive tissue hypothesis? brains require more energy, so the gut had to be reduced, and larger brains and tool use led to higher quality diets. increasing body size means that homo neanderthalensis had to include more fat in its diet. brains require more energy, so the gut had to be reduced as brains got bigger. brains require more fat, so the gastrointestinal viscera (gut) had to expand, and hands were needed to acquire more food.