With frequency-dependent selection, highest mortality can be expected in ____
a. the most abundant genotype
b. the least abundant genotype
c. the least well-adapted genotype
d. heterozygous genotypes
e. homozygous recessive genotypes
ANSWER: a
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The disease trichinosis is most commonly found in persons who
a. eat undercooked beef. b. walk barefoot in a rice field. c. eat undercooked pork. d. are bitten by mosquitoes. e. eat undercooked fish.
The pitted end walls of sieve elements are called ____
a. plasmodesmata b. sieve tubes c. companion cells d. perforation plates e. sieve plates
Changes in community composition and structure over time are called
A) succession. B) stratification. C) zonation. D) characterization.
Which of the following events concerning a response to a stimulus comes first?
a. transmission b. reception c. action by effectors d. involvement of the brain and spinal cord e. integration