BIO 345 Unit 1 Cogbooks Questions and Answers with Verified
Solutions | Latest 2026 Update
Q: A species that has a high rate of long-distance dispersal is more likely to
colonize new habitat. But that species may also be less likely to adapt to local
conditions, because migration will be stronger than local selection pressures for
many loci. In light of those considerations, when do you expect that increasing
dispersal might result in the evolution of a larger geographic range, and when
might it not?
Answer:
When there are opportunities for long-distance dispersal to establish isolated
populations, increased dispersal is likely to lead to larger geographic ranges. This is
because a new isolated population that is established by long-distance dispersal is
sometimes largely or completely free of later gene flow. (Consider the seeds of a
continental species of plant that wash up on the shore of a remote oceanic island.
There is a very good chance that no seeds of that species from the continent will ever
wash up on the same shore again.) However, if new populations continue to receive
immigrants from a source population, local adaptation can be prevented by gene
swamping, and further expansion of the species' range prevented.
, BIO 345 Unit 1 Cogbooks Questions and Answers with Verified
Solutions | Latest 2026 Update
Q: What is most likely to increase rates of gene flow for a benthic (bottom
dwelling) marine invertebrate?
Answer:
Q: a. Increased lifespan of planktonic larvae
Answer:
Q: b. Greater maximum age reached by adults
Answer:
Q: c. Stronger natural selection for camouflage color patterns
Answer:
, BIO 345 Unit 1 Cogbooks Questions and Answers with Verified
Solutions | Latest 2026 Update
Q: d. Greater maximum age reached by adults
Answer:
Q: e. I don't know the answer
Answer:
A
Q: You observe a very narrow cline in the middle of a broadly distributed species'
range. From this
Answer:
you could conclude that ____________.
Q: a. selection is strong
Answer:
Solutions | Latest 2026 Update
Q: A species that has a high rate of long-distance dispersal is more likely to
colonize new habitat. But that species may also be less likely to adapt to local
conditions, because migration will be stronger than local selection pressures for
many loci. In light of those considerations, when do you expect that increasing
dispersal might result in the evolution of a larger geographic range, and when
might it not?
Answer:
When there are opportunities for long-distance dispersal to establish isolated
populations, increased dispersal is likely to lead to larger geographic ranges. This is
because a new isolated population that is established by long-distance dispersal is
sometimes largely or completely free of later gene flow. (Consider the seeds of a
continental species of plant that wash up on the shore of a remote oceanic island.
There is a very good chance that no seeds of that species from the continent will ever
wash up on the same shore again.) However, if new populations continue to receive
immigrants from a source population, local adaptation can be prevented by gene
swamping, and further expansion of the species' range prevented.
, BIO 345 Unit 1 Cogbooks Questions and Answers with Verified
Solutions | Latest 2026 Update
Q: What is most likely to increase rates of gene flow for a benthic (bottom
dwelling) marine invertebrate?
Answer:
Q: a. Increased lifespan of planktonic larvae
Answer:
Q: b. Greater maximum age reached by adults
Answer:
Q: c. Stronger natural selection for camouflage color patterns
Answer:
, BIO 345 Unit 1 Cogbooks Questions and Answers with Verified
Solutions | Latest 2026 Update
Q: d. Greater maximum age reached by adults
Answer:
Q: e. I don't know the answer
Answer:
A
Q: You observe a very narrow cline in the middle of a broadly distributed species'
range. From this
Answer:
you could conclude that ____________.
Q: a. selection is strong
Answer:
