How many chromosomes are in a normal human karyotype?
a. 23
b. 44
c. 2
d. 46
Ans: d. 46
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The stretch reflex
a. is an adaptation that enables humans to hold objects steadily for extended periods if time. b. is activated by stretch-sensitive receptors inside the muscle spindles. c. is a simple, stereotyped, and repeatable motor action. d. is elicited by a sensory stimulus. e. all of these
Over several generations in a population, inbreeding tends to
A. decrease the relative proportions of homozygotes. B. decrease the likelihood of heterozygotes. C. stabilize the balance of genotypes predicted by the Hardy-Weinberg equilibrium. D. All of the choices are correct.
An herbivore with the ability to recognize odors and avoid toxic plants is exhibiting evidence of ____
a. predation b. herbivory c. coevolution d. optimal foraging e. mimicry
Which of the following most accurately summarizes the effects of mutations on living things?
a. most mutations are beneficial and a few are harmful b. many mutations have little or no effect, but some can be harnful or benficial c. about half of mutations are beneficial and half are harmful d. most mutations are harmful, but some have little effect