Which of the following is not an assumption of Hardy-Weinberg equilibrium?
A. Populations must select non-random
mates.
B. No selection must be taking place.
C. Mutations are not occurring.
D. Populations must be large.
E. Individuals are not entering or leaving the
population.
A
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On a short-term basis, water loss in plants may be controlled by the
A. opening of the stomata in the leaves to allow more carbon dioxide to enter. B. closing of the stele in the roots. C. bending of the petioles on the leaves. D. opening the Casparian strips in the roots. E. closing of the stomata in the leaves to limit transpiration.
To summarize the conclusions of modern human behavioral genetics research, behavior is influenced by
_____________________, _____________________, and _____________________ factors. Fill in the blank(s) with the appropriate word(s).
During male ejaculation, the internal urethral sphincter closes tightly to
A) prevent urine from leaking into the urethra. B) isolate the ureters from the urinary bladder. C) block movement of mucus from the bulbourethral gland into the ejaculatory duct. D) keep sperm from moving into the ductus deferens. E) allow seminal vesicle to transfer sperm to the epididymis.
What results as the size of a population approaches the carrying capacity of its environment?
A) The growth rate increases. B) A graph of population growth resembles a "J." C) The population stabilizes at its maximum size. D) Birth rates become proportionally much greater than the death rates.