Answer the question using the accompanying figure. The letter “A” represents ____
a. rapid growth
b. negative growth
c. prereproductive populations
d. postreproductive populations
e. zero growth
ANSWER: e
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GGG and GGC are codons for the amino acid, glycine. A mutation caused the insertion of a cytosine in place of the guanine during DNA replication. Over many generations the DNA changes so that the frequency of GGC is similar to that of GGG. What effect does this mutation have on the population's mean fitness?
A. As the frequency of the GGC codon increases, the population's mean fitness level will remain the same.
B. As the frequency of the GGC codon increases, the population's mean fitness level will initially increase, but once GGC and GGG occur with equal frequency, the mean fitness will decrease.
C. As the frequency of the GGC codon increases, the population's mean fitness level will decrease.
D. As the frequency of the GGC codon increases, the population's mean fitness level will increase.
Radiometric dating of the most ancient fossils uses the
a. dating volcanic rocks above and below the fossil-containing layer of sedimentary rock. b. ratio of carbon 14 to carbon 12 in a sample of the fossil. c. counting of the rings of trees found with the fossils. d. comparison of unknown fossils with fossils of known age. e. transmission of radio waves through the fossil.
Which of the following is mismatched?
a. cytokinin; retards aging b. auxin; promotes cell elongation c. gibberellin; involved in phototropism and gravitropism d. abscisic acid; promotes stomatal closure e. ethylene; promotes leaf abscission
Using fertility awareness as a means of birth control requires a detailed understanding of the female reproductive cycle. Given what you know about the cycle, when exactly should a woman avoid sex to prevent pregnancy if she is relying on fertility
awareness? Make sure to explain your answer. What are the challenges to this method of birth control? What will be an ideal response?