Given a population that contains genetic variation, what is the correct sequence of the following events, under the influence of natural selection?
1. well-adapted individuals leave more offspring than do poorly adapted individuals
2. a change occurs in the environment
3. genetic frequencies within the population change
4. poorly adapted individuals have decreased survivorship
a. 2, 4, 1, 3
b. 4, 2, 1, 3
c. 4, 1, 2, 3
d. 4, 2, 3, 1
e. 2, 4, 3, 1
Ans: a. 2, 4, 1, 3
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A. is what happens as a population decreases and becomes more vulnerable to extinction from a variety of causes. B. begins when one species in an ecosystem goes extinct and other species follow. C. is what happens when competing species fight over a single niche, often driving both species to extinction. D. is a spiral of events that occur once a species has become overcrowded through excess reproduction. E. is a spiral of events that includes introduction of competing species, overexploitation, and disease, in that order.
The process by which pollen is transferred to the ovule is called
(a) transmigration. (b) fertilization. (c) pollination. (d) all of the above.
Pure water has a water activity value of
A. 1.00. B. 0.80. C. 0.70. D. 0.90.
Consider the case of X-linked inheritance of a recessive mutant allele. Among progeny from a cross of an unaffected male and a heterozygous female carrier,
A: all male offspring of would show the trait. B: all female offspring who receive the recessive mutant X would show the trait. C: all male offspring who receive the recessive mutant X chromosome would show the trait. D: all female offspring would be carriers. E: roughly half of the female offspring would show the trait.