A population of mosquitoes is exposed to the pesticide DDT for several generations. At the end of that time, most individuals in the population are resistant to DDT. The most likely reason is that:
A. DDT caused the mutations that lead to
resistance.
B. some individuals in the original population
had the mutations that lead to resistance.
C. by chance, new mutations that lead to
DDT resistance arose after DDT was used.
D. somatic mutations in the original
population were passed on to subsequent
generations.
E. random mutations in each generation
made mosquitoes resistant to DDT.
B
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Migration, genetic drift, and mutation are like natural selection in that they:
A. result in evolution of a population. B. may alter the allele frequency in a population. C. may alter the genotype frequency in a population. D. are all methods of evolutionary change. E. All of the answer options are correct.
Many factors are believed to reduce songbird breeding success in fragmented habitats. Select the
exception.
a. brood parasitism by cowbirds b. nest predation by blue jays c. lack of necessary habitat types d. nest predation by domestic cats e. increased connections between habitats
Antibodies ________
A) are shaped like the letter B B) are generalists in that any antibody can bind to any antigen C) assist in destroying particular antigens D) are produced by T cells
Stem cells developed by inserting genes that regulate the transcription of specific genes into cells from an adult are ________ cells
A) induced pluripotent stem B) embryonic disk C) gastrula D) chorionic villi E) embryonic stem