BIO 345 Exam 1 Questions and Answers with Verified Solutions |
Latest 2026 Update
Q: You have set up an experimental population consisting entirely of plants that are
heterozygous at a locus with two alleles. You allow these individuals to
self-fertilize to create the next generation. Assuming that the population
conforms to all Hardy-Weinberg assumptions other than random mating, which
of the following statements is true of the genetic composition of that next
generation?
Answer:
homozygous gentoypes will occur at a higher frequency than predicted by the HW
model
Q: Which of the following conclusions can we draw from the figure, which depicts
mtDNA types found in northern elephant seals sampled before, during, and after
their hunting-induced bottleneck?
Answer:
there was much more variation in the population before the bottleneck than during or
after the bottleneck, indicating that the temporary reduction in population size was
responsible for the low levels of genetic diversity in current populations
, BIO 345 Exam 1 Questions and Answers with Verified Solutions |
Latest 2026 Update
Q: Drag each statement to the correct box to indicate whether it is true or false of
genetic drift.
Answer:
TRUE
Genetic drift is random change in allele frequencies due to sampling effects in finite
populations. Essentially, because some individuals no longer contribute alleles to the
gene pool,
due to random death or other reasons preventing reproduction, genetic drift causes
random
changes in allele frequencies over generations.
Genetic drift decreases heterozygosity in a population.
Genetic drift causes fluctuation of allele frequencies from one generation to the next
in finite
populations.
, BIO 345 Exam 1 Questions and Answers with Verified Solutions |
Latest 2026 Update
Q: FALSE
Answer:
Genetic drift maintains genetic variation within a finite population.
Genetic drift causes separate populations of the same species to converge on the
same allele
frequencies over time.
Q: Drag each statement to the correct box to indicate whether it is correct or
incorrect of allele
Answer:
frequency change under genetic drift. TRUE
At any given time, the probability that a neutral allele will eventually be fixed in a
population
equals the frequency of the allele at that time.
In a Wright-Fisher population, genetic drift reduces heterozygosity by an average
factor of ½N
each generation.
Random fluctuations in allele frequency from one generation to the next are more
pronounced in small than in large populations under genetic drift.
, BIO 345 Exam 1 Questions and Answers with Verified Solutions |
Latest 2026 Update
Q: FALSE
Answer:
In finite populations, one allele at a neutral locus will eventually be fixed by genetic
drift only
when the population size is less than 100 individuals.
Q: The fixation probability of a new neutral mutation in a diploid population is ½N.
Answer:
Latest 2026 Update
Q: You have set up an experimental population consisting entirely of plants that are
heterozygous at a locus with two alleles. You allow these individuals to
self-fertilize to create the next generation. Assuming that the population
conforms to all Hardy-Weinberg assumptions other than random mating, which
of the following statements is true of the genetic composition of that next
generation?
Answer:
homozygous gentoypes will occur at a higher frequency than predicted by the HW
model
Q: Which of the following conclusions can we draw from the figure, which depicts
mtDNA types found in northern elephant seals sampled before, during, and after
their hunting-induced bottleneck?
Answer:
there was much more variation in the population before the bottleneck than during or
after the bottleneck, indicating that the temporary reduction in population size was
responsible for the low levels of genetic diversity in current populations
, BIO 345 Exam 1 Questions and Answers with Verified Solutions |
Latest 2026 Update
Q: Drag each statement to the correct box to indicate whether it is true or false of
genetic drift.
Answer:
TRUE
Genetic drift is random change in allele frequencies due to sampling effects in finite
populations. Essentially, because some individuals no longer contribute alleles to the
gene pool,
due to random death or other reasons preventing reproduction, genetic drift causes
random
changes in allele frequencies over generations.
Genetic drift decreases heterozygosity in a population.
Genetic drift causes fluctuation of allele frequencies from one generation to the next
in finite
populations.
, BIO 345 Exam 1 Questions and Answers with Verified Solutions |
Latest 2026 Update
Q: FALSE
Answer:
Genetic drift maintains genetic variation within a finite population.
Genetic drift causes separate populations of the same species to converge on the
same allele
frequencies over time.
Q: Drag each statement to the correct box to indicate whether it is correct or
incorrect of allele
Answer:
frequency change under genetic drift. TRUE
At any given time, the probability that a neutral allele will eventually be fixed in a
population
equals the frequency of the allele at that time.
In a Wright-Fisher population, genetic drift reduces heterozygosity by an average
factor of ½N
each generation.
Random fluctuations in allele frequency from one generation to the next are more
pronounced in small than in large populations under genetic drift.
, BIO 345 Exam 1 Questions and Answers with Verified Solutions |
Latest 2026 Update
Q: FALSE
Answer:
In finite populations, one allele at a neutral locus will eventually be fixed by genetic
drift only
when the population size is less than 100 individuals.
Q: The fixation probability of a new neutral mutation in a diploid population is ½N.
Answer:
