The wide variation in skin color in humans is best explained by
a. environmental changes like improvements in diet.
b. genetic drift.
c. skin color is a polygenic trait.
d. crossing over.
e. artificial selection.
Answer: c. skin color is a polygenic trait.
You might also like to view...
What does it mean if a plant is dioecious?
A. There is double fertilization of the embryo. B. Pollination and fertilization are separate events. C. There are separate male and female sporophytes. D. The sporophyte and the gametophyte are on the same plant.
Primary growth (lengthening) arises from __________. Fill in the blank(s) with the appropriate word(s)
Salt-water and fresh-water fish both maintain similar blood osmotic pressures, and NaCl concentrations, which are also similar to humans. Explain the ionic and osmotic challenges faced by salt and freshwater fish, and how they manage to homeostatically maintain blood ionic concentrations and osmotic pressures.
What will be an ideal response?
The conversion of amino acids to carbohydrates is an example of
A) amination. B) gluconeogenesis. C) substrate-level phosphorylation. D) beta-oxidation. E) electron transport.