The link between population-limiting factors and r-selected species is represented by opportunistic species being limited by
A. density-independent factors and having no offspring.
B. density-dependent factors and having many offspring.
C. density-dependent factors and having few offspring.
D. density-independent factors and having many offspring.
E. density-independent factors and having few offspring.
D. density-independent factors and having many offspring.
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The onset of AIDS is often accompanied by
A. a steep drop in T cell numbers. B. macrophage infection. C. a positive HIV test. D. lung infections and other opportunistic infections. E. Kaposi's sarcoma.
Which population is more likely to be affected by genetic drift?
a. 12 squirrels in a forest b. 49 herons in a colony c. 215 fleas on a dog d. 1350 mice in a house e. 3000 zebra in a herd
Paramecia use cilia for locomotion and for gathering organic matter. How are rotifers similar?
A. Rotifers and ciliates are thought to have given rise to all other animal phyla. B. The corona is made of cilia, and used for swimming and feeding. C. Both lack a gut. D. Rotifers are single-celled protists.
A recessive gene for red-green color blindness is located on the X chromosome in humans. Assume that a woman with normal vision (her father is color blind) marries a color-blind male. What is the likelihood that this couple's first son will be color
blind? A) 100% B) 50% C) 25% D) 0% E) 75%