Overgrazing in savannas by domestic animals has contributed to its conversion into:a
chaparral.
b. grassland.
c. desert.
d. taiga.
e. ecotones.
c
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What processes have been hypothesized to influence the evolution of mutation rates?
A) natural selection only B) genetic drift only C) both natural selection and genetic drift, acting in the same direction to either increase or decrease mutation rates D) both natural selection and genetic drift, acting in opposing directions: one process favors increasing mutation rates and the other favors decreasing mutation rates
The evolutionary trends in primates include all of the following EXCEPT
A. stereoscopic vision. B. large, complex brain. C. a rounded, protruding face. D. mobile limbs. E. reduced reproductive rate.
At the beginning of prophase I, a total of ________ molecules of DNA are contained in a developing human sperm cell
A) twice as many (as compared to mature sperm) B) half as many (as compared to somatic cells) C) 92 D) 23 E) 46
The most common lethal genetic disease in the United States is __________.
A. sickle-cell disease B. hemophilia C. cystic fibrosis D. Huntington's disease