A rapidly growing population is indicated by
a. A.
b. B.
c. C.
d. D.
e. none of these.
A
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In disruptive selection, over time
A. a population increases its variation (e.g., a wide selection of all beak sizes). B. the population is strongly selected for in two directions (e.g., larger beak size and smaller beak size). C. a population goes extinct. D. the most extreme outliers of a population are eliminated (e.g., the largest beaks and smallest beaks are eliminated). E. the population is strongly selected for in one direction (e.g., larger beak size).
A primary function of the nucleus in eukaryotic cells:
A) to transport proteins outside of the cell B) to synthesize proteins from mRNA C) to produce ATP that powers the cell D) to contain the cells hereditary material E) none of these
Thanks to a novel recessive mutation, a certain plant species has begun to invade colder Arctic regions outside of its normal range. However, this cold-tolerant mutation has not yet become fixed in the population. A second mutation arises that promotes self-pollination. Do you predict that the self-pollination allele will be selected for in the Arctic regions? Why or why not?
A. No. Plants that produce flowers must be cross-pollinated for proper seed development. B. Yes. The self-pollinated plant is more likely to maintain the cold-tolerant mutation, and plants in the Arctic are unlikely to be visited by pollinators. C. No. Outcrossing is always beneficial, since it enhances genetic diversity. D. Cannot make a prediction from the information given. It depends on whether the plant is normally insect-pollinated or wind-pollinated.
Genes affect traits:
a. in just one environment. c. by coding for them. b. by producing a norm of reaction. d. All of the above.