The Wizard Who Flew Through Biology

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  • Topic: Evolution, Selection, Speciation
  • Pages : 12 (1525 words )
  • Download(s) : 312
  • Published : January 8, 2012
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___24.In which population is the frequency of the allele for brown feathers highest? a.
A
b.
B
c.
C
d.
D
e.
E

____25.In which population would it be least likely that an accident would significantly alter the frequency of the brown allele? a.
A
b.
B
c.
C
d.
D
e.
E

____26.The probability of a mutation at a particular gene locus is ____, and the probability of a mutation in the genome of a particular individual is ____. a.
high; low
b.
low; high
c.
low; low
d.
high; high
e.
moderate; moderate

____27.Which factor is the most important in producing the variability that occurs in each generation of humans? a.
mutation
b.
sexual recombination
c.
genetic drift
d.
nonrandom mating
e.
natural selection

____28.In a large, sexually reproducing population, the frequency of an allele changes from 0.6 to 0.2. From this change, one can most logically assume that, in this environment, a.
the allele is neutral.
b.
the allele mutates readily.
c.
random processes have changed allelic frequencies.
d.
there is no sexual selection.
e.
the allele reduces fitness.

____29.You are maintaining a small population of fruit flies in the laboratory by transferring the flies to a new culture bottle after each generation. After several generations, you notice that the viability of the flies has decreased greatly. Recognizing that small population size is likely to be linked to decreased viability, the best way to reverse this trend is to a.

cross your flies with flies from another lab.
b.
reduce the number of flies that you transfer at each generation. c.
transfer only the largest flies.
d.
change the temperature at which you rear the flies.
e.
shock the flies with a brief treatment of heat or cold to make them more hardy.

____30.If the frequency of a particular allele that is present in a small, isolated population of alpine plants should change due to a landslide that leaves an even smaller remnant of surviving plants, then what has occurred? a.

a bottleneck
b.
genetic drift
c.
microevolution
d.
A and B only
e.
A, B, and C

____31.Through time, the movement of people on Earth has steadily increased. This has altered the course of human evolution by increasing a.
nonrandom reproduction.
b.
geographic isolation.
c.
genetic drift.
d.
mutations.
e.
gene flow.

____32.Gene flow is a concept best used to describe an exchange between a.
species.
b.
males and females.
c.
populations.
d.
individuals.
e.
chromosomes.

Use the information below to answer the following questions.

In the year 2500, five male space colonists and five female space colonists (all unrelated to each other) settle on an uninhabited Earthlike planet in the Andromeda galaxy. The colonists and their offspring randomly mate for generations. All ten of the original colonists had free earlobes, and two were heterozygous for that trait. The allele for free earlobes is dominant to the allele for attached earlobes.

____33.If four of the original colonists died before they produced offspring, the ratios of genotypes could be quite different in the subsequent generations. This is an example of a.
diploidy.
b.
gene flow.
c.
genetic drift.
d.
disruptive selection.
e.
stabilizing selection.

____34.The higher the proportion of loci that are "fixed" in a population, the lower is that population's a.
nucleotide variability.
b.
genetic polymorphism.
c.
average heterozygosity.
d.
A, B, and C
e.
A and B only

Choose among these options to answer the following questions. Each option may be used once, more than once, or not at all.

A.
random selection
B.
directional selection
C.
stabilizing selection
D.
disruptive selection
E.
sexual selection

____35.A certain species of land snail exists as either a cream color or a solid brown color. Intermediate individuals are relatively rare. a.
A
b.
B
c.
C
d.
D
e.
E

____36.Pathogenic...
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