Portion of Figure 21.11
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Refer to the accompanying figure for questions 26-28.
The kelp shown in the accompanying figure represents the ____ stage in its life cycle.
A. spore-bearing
B. gamete-forming
C. haploid
D. motile
E. feeding
Answer: A
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You are studying with a classmate who asks you about the concept of a replacement rate. She wants to know what happens to a population if the replacement rate is reached? She also assumes the average human replacement rate is 2.0. What would you tell her?
A. When replacement rate is reached, the population declines. The replacement rate is greater than 2.0 to make up for declining birth rates. B. When replacement rate is reached, the population increases. The replacement rate is lower than 2.0 to make up for increasing birth rates. C. When replacement rate is reached, the population is in equilibrium. The replacement rate is equal to 2.0 to replace both mother and father. D. When replacement rate is reached, the population is in equilibrium. The replacement rate is greater than 2.0 because some individuals die before they reproduce. E. When replacement rate is reached, the population declines. The replacement rate is lower than 2.0 to make up for increasing birth rates.
The inheritance of sex-influenced traits can be dominant in one sex but recessive in the other
a. True b. False
The selective advantage linked to the high frequency of the cystic fibrosis allele in Caucasians is:
a. an increased resistance to falciparum malaria. b. the prevention of excessive water loss associated with certain types of diarrhea. c. production of an enzyme to break down cholera toxin. d. increased mucous secretions for the removal of infectious cells. e. an increased probability of Salmonella infection.
If two different species of fish fossils were found in two different layers of sedimentary rock, what might one infer about the specimens?
A. The species in the higher layer evolved from the species in the lower layer B. The two species are unrelated C. They died at the same time D. The species in lower layer died first E. The species in the higher layer died first