In which of the following pairs do both evolutionary processes introduce new genetic variation into a population?
a. Natural selection and genetic drift
b. Mutation and gene flow
c. Natural selection and gene flow
d. Gene flow and genetic drift
Answer: b. Mutation and gene flow
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True or false: External fertilization is generally associated with large numbers of offspring and low levels of parental care
A. true B. false
Microevolution involves
A. an increase in the number of individuals in a population, but not a change in allele frequency. B. changes in a population's gene pool. C. changes in the ratio of males to females in a population. D. an increase in the number of individuals and a change in the ratio of males to females. E. an increase in migration, but not a change in allele frequency.
Why is it virtually impossible to stamp out a disease caused by a zoonotic virus?
A. You'd have to drive the vector organism extinct to do so. B. Many vector organisms have multiple stages of their life cycle that can carry a zoonotic virus, which complicates controlling the vector-borne transmission. C. Many viruses transmitted in this manner may utilize more than one vector organism. D. Many zoonotic viruses may be able to reside in more than one host organism, complicating control measures. E. All of the above are correct.
Most human embryos that are aneuploid
A. result in Down's syndrome. B. result in sterility. C. are spontaneously aborted in the first trimester. D. can develop and survive to adulthood. E. are usually the result of increased nondisjunction in the gametes of older men.