What condition is necessary for genetic drift to have a significant effect on a population?
a. A natural disaster must occur.
b. The population needs to be small.
c. A portion of the population needs to migrate.
d. Mutation must occur.
e. Gene flow must occur.
Ans: b. The population needs to be small.
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The pentose phosphate pathway produces
A. glyceraldehyde 3-phosphate. B. NADPH. C. CO2. D. All of the choices are correct.
The methylation and demethylation of regions
of DNA triggered by changes in the environment and resulting in phenotypic changes are an example of
a. pleiotropy. b. environmental effects. c. epistasis d. epigenesis. e. more than one of these
A-T base pairs in a DNA double helix
A: are of a substantially different length than G-C base pairs. B: are chemically distinct from G-C base pairs. C: are not accessible to DNA binding proteins. D: are more heat stable than G-C base pairs. E: form three hydrogen bonds with each other.
People who are very underweight often complain of being cold. However, individuals who are overweight are less likely to complain of being cold. Explain why this might be the case
What will be an ideal response?