Being born with extra fingers on a hand is called polydactyly. This is more common in some populations in North America than others due to ____.
A. natural selection in favor of extra fingers in these populations
B. random mating with other populations in North America
C. an increase in mutation rate in these populations
D. a founder effect because their ancestors from Europe carried the alleles
E. migration of people with multiple fingers out of the population
D. a founder effect because their ancestors from Europe carried the alleles
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Adventitious roots arise from a plant’s stem
a. True b. False
A chromosome with two arms of similar length is referred to as
A) acrocentric. B) homologous. C) telocentric. D) metazoan. E) metacentric.
A(n) ____________________ is a large-scale community of organisms in a major ecological setting. Fill in the blank(s) with the appropriate word(s)
Which statement about ion channels and voltage-gated ion channels is true?
A) Voltage-gated ion channels are always open. B) Ion channels allow ions to flow against their concentration gradients. C) Voltage-gated ion channels only open when a stimulus is applied. D) Ion channels do not contribute to resting membrane potential.