21) Evolution by genetic drift most obvious in:
A) invertebrate species.
B) : 1380845.
21) Evolution by genetic drift is most obvious in:
A) invertebrate species.
B) migratory species.
C) aquatic populations.
D) small populations.
22) Mutations:
A) are always detrimental.
B) account for most of the change in allele frequency in a population.
C) may do nothing, may be harmful, or may be beneficial.
D) are always beneficial.
23) Which of the following processes is not an agent of microevolution?
A) gene flow
B) natural selection
C) mutation
D) polygenic inheritance
E) genetic drift
24) ________ is necessary for a population to survive over successive generations in response to environmental changes.
A) Adaptation
B) Sexual selection
C) Speciation
D) Gene flow
25) In order for migration to alter allele frequencies in another population:
A) a large portion of the population must die off.
B) a large portion of the population must leave as new individuals arrive.
C) the gene pool of the migrating population must be different from the population it is joining.
D) the gene pools of the populations involved must be very similar.
26) Two nearby populations in which there is some movement of individuals between the populations are an example of:
A) disruptive selection.
B) bottleneck effect.
C) genetic drift.
D) gene flow.
27) A bottleneck may be dangerous to a population because:
A) the potential for natural selection is greatly increased.
B) mutation rate is increased.
C) genetic variability is diminished.
D) mutation rate is decreased.
28) Which of the following is most likely to cause genetic changes in a population that make it better adapted to its environment?
A) nonrandom mating
B) natural selection
C) gene flow
D) genetic drift
29) The term “natural selection” is not interchangeable with the term “evolution” because:
A) natural selection is just a theory, whereas evolution has been proven.
B) a population may evolve in ways other than through natural selection.
C) Darwin coined the term “natural selection,” but not “evolution.”
D) natural selection does not always lead to evolution.
30) Habitats set aside for endangered species are often sectioned into areas by roads, producing separate small populations. This causes problems in conservation because it reduces:
A) gene flow between populations.
B) the number of potential leaders.
C) sharing of resources.
D) interaction among generations.
21) Evolution by genetic drift most obvious in:
A) invertebrate species.
B) : 1380845
