Being heterozygous for the hemoglobin gene variant that causes the disease sickle-cell anemia can be advantageous in what situation?
A. in areas where malaria is endemic
B. when iron intake is too low in the diet
C. in elite athletes because it slightly decreases oxygen affinity
D. when a person has anemia caused by other factors
E. when a person is at high altitude
A. in areas where malaria is endemic
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Populations ____
a. are only limited by one factor at a time b. increase arithmetically c. may increase indefinitely d. are limited by the carrying capacity e. overcome limiting factors by increasing their biotic potential
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
A replicated DNA molecule contains one new strand and one old strand
a. True b. False
In summer, when plant roots are converting sugar to store as starch, the root is the sugar ________ and the leaves are the sugar ________
A) source; source B) sink; sink C) source; sink D) sink; source or sink E) sink; source