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.
Answer: B
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A woman with which of the following human conditions would exhibit normal physical features?
a. triple-X syndrome b. Turner syndrome c. Down syndrome d. cri-du-chat
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A. Zygomycota. B. Imperfect fungi. C. Ascomycota. D. Basidiomycota. E. Actinomycetes.
Chromatids
What will be an ideal response?