If modern humans came from Africa, what explains the loss of pigmentation seen in different races?
A. Since there was less sunlight, darker
pigmentation wasn't needed.
B. The lighter-pigmented humans are found
in colder climates, where having less
pigmentation preserves heat.
C. The diet found in the areas where lighterpigmented
humans are found contain
compounds that interfere with the production
of pigmentation.
D. Lighter pigment allows for more efficient
production of vitamin D, an advantage in
areas with less sunlight.
E. None of the answer options is correct.
D
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The part of the brain that connects the cerebellum to higher integrating centers of the forebrain is the
a. cerebrum. b. pons. c. cerebellum. d. fissure of Rolando. e. hypothalamus.
If all offspring of a cross have the genotype Aa, the parents of the crosses would most likely be
a. AA ? aa. b. Aa ? Aa. c. Aa ? aa. d. AA ? Aa. e. none of these.
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