Why is a species that has few individuals at greater risk of extinction than a species with a large population size?
A) A species with few individuals is more likely to be eliminated by a reduction in population size caused by a chance environmental event like bad weather or a fire.
B) There's no risk to a small population as long as genetic diversity is high.
C) A species with few individuals is likely to have a high percentage of heterozygotes. This can reduce the likelihood that the species can adaptively evolve in response to environmental changes.
D) Genetic drift allows small populations to avoid the loss of advantageous alleles from the population.
A
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The outside of a neuron is positively charged at resting potential. Why do K+ ions leave the cell when K+ channels open during an action potential?
A. The diffusion gradient is the only factor that affects ion movement. B. K+ ions are actively pumped out by the sodium-potassium pump acting in reverse. C. Voltage-gated K+ channels open when membrane potential reaches +50 mV during the depolarization phase. The diffusion gradient and electrical force cooperate to drive K+ ions out of the cell. D. Negatively charged proteins leave the cell at the onset of the action potential.
Humans cannot survive long at altitudes greater than 6000 m because ________.
A. the partial pressure of O2 becomes less than half that at sea level B. there is much more CO2 in the atmosphere at the higher altitudes than at sea level C. the diaphragm cannot be contracted enough to produce a full breath D. alveoli become compressed at the lower atmospheric pressures
The Gulf Stream takes relatively cold water toward northwestern Europe
Indicate whether the statement is true or false.
Multiple effects of a single gene is known as
a. expressivity. b. penetrance. c. codominance. d. pleiotropy. e. multiple alleles.