Which of the following statements about mutations is false?
a. Most mutations are neutral or deleterious
b. Mutations are small scale changes in DNA.
c. Mutations affect individuals but cannot be passed on to offspring.
d. Mutations can improve an organism's adaptation to its environment.
c
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The nervous system damage symptomatic of untreated PKU is due to
A. too much phenylalanine being transported into nerve cells. B. too few of the other seven neutral amino acids being transported into nerve cells. C. accumulation of the breakdown products of phenylalanine in nerve cells. D. none of these. E. it is not clearly known.
Two morphs of a species exist in an imaginary jungle: Purple and green. A predator is introduced that finds the color purple distasteful, but still consumes many but not all green individuals. Purple is a dominant genotype (allele C), while green is recessive (allele c). What do you think will happen to the frequency of allele c after two generations of heavy predation?
A. c will go extinct due to the high degree of selection against it. B. c will likely remain in the population for a few generations, hidden by the dominant allele 'C'. C. C will be the only allele left in the population after one generation. D. None of the above.
Protozoans are an important part of the food chain ingesting large numbers of
A. fish. B. bacteria and algae. C. shellfish. D. other protozoans.
Life history patterns:
a. have no genetic component. b. are subject to the pressures of natural selection. c. exist only in organisms that exhibit parental care.