22. Which of the following individuals is acting to create a free-rider problem?

ID: 68913 • Letter: 2

Question

a. By reliably reciprocating a cooperative behavior, all individuals in the population increase their fitness.

b. Some daughters forego having offspring of their own as they help their mother with brood care.

c. An individual spends only half an hour grooming others for each hour of grooming it has received.

d. Some individuals forgo reproduction to avoid overpopulation of a species’ habitat.

23. Why were the first RNA replication experiments insufficient support for the RNA world hypothesis?

a. The experiments did not demonstrate natural selection.

b. RNA could not adapt to environmental challenges.

c. The RNA produced was not self-replicating.

d. No mutations occurred in the RNA.

e. Mutations occurred, but they were not heritable.

24. Among which of the following groups of organisms is cooperation via reciprocal altruism most likely to evolve (assuming all else is equal)?

a. Birds from across a species’ range that congregate for a short time at a resting spot during migration

b. Short-lived, immobile tidal organisms that are in constant contact with one another and have a high mortality via predation

c. Female tigers that each inhabit their own large home range

d. Primates in a social group that frequently interact with the same individuals

25.Which of the following is not a prezygotic isolating mechanism?

a. Habitat isolation

b. Temporal isolation

c. Hybrid inviability

d. Behavioral isolation

e. Gametic incompatibility

Q22).a

Q23).c

Q24). d

Q25). d

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