Human birth weight is a classic example of the results of
a) disruptive selection
b) directional selection
c) stabilizing selection
d) genetic drift
e) genotype by environment interaction
Answer: c) stabilizing selection
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Hair cells are found in structures represented by which numbers?
A) 1 and 2 B) 3 and 4 C) 5 and 7 D) 6 and 8 E) 9 and 10
When an organism dies, its muscles remain in a contracted state termed rigor mortis for a brief period of time. Contributing most directly to this phenomenon is
A. the lack of calcium to bind to troponin. B. the lack of ATP to break cross-bridges between thick and thin filaments. C. the absence of an oxygen supply to muscle. D. the inability to synthesize actin and myosin.
A chromosome that results when the centromere splits in the wrong plane during meiosis, forming identical arms, is a(n)
A) ring chromosome. B) metachromosome. C) parachromosome. D) isochromosome.
Based on Figure 53-3, the decline in the moose population in 1996 was most likely due to:
a. a predictable increase in the wolf population.
b. an unpredictable increase in the wolf population.
c. a decrease in the intrinsic rate of increase for the moose population.
d. a decline in the food supply.
e. an unknown disease organism