During meiosis, maternal, and paternal chromosomes can exchange genetic material at sites called
A) chromatids. B) chiasmata. C) centromeres. D) centrioles.
B
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The release of testosterone requires
a. GnRH. b. luteinizing hormone. c. Sertoli cells. d. GnRH and luteinizing hormone. e. GnRH, luteinizing hormone, and Sertoli cells.
In a population with brown and green alleles for color, genetic drift
A. occurs when individuals move into or out of a population, changing the allele frequencies in the population. B. has more effect on the evolution of a large population. C. always increases the frequency of brown alleles in the population. D. causes populations to become better adapted to their environments. E. has more effect on the evolution of a small population.
Spatial summation is characterized by:
a. several presynaptic neurons releasing neurotransmitter simultaneously. b. several presynaptic neurons releasing neurotransmitter in a sequential pattern. c. several postsynaptic neurons receive sequential inputs from several presynaptic neurons. d. a single presynaptic neuron firing multiple times in rapid succession. e. a single presynaptic neuron directly contacting several postsynaptic neurons.
Any substance that can cause an immune response is a/an:
A) microbe. B) nonspecific defense. C) antigen. D) interferon. E) antibody.