Formation of New Species

Review Questions

Which situation would most likely lead to allopatric speciation?

  1. Flood causes the formation of a new lake.
  2. A storm causes several large trees to fall down.
  3. A mutation causes a new trait to develop.
  4. An injury causes an organism to seek out a new food source.

Hint:

A

What is the main difference between dispersal and vicariance?

  1. One leads to allopatric speciation, whereas the other leads to sympatric speciation.
  2. One involves the movement of the organism, and the other involves a change in the environment.
  3. One depends on a genetic mutation occurring, and the other does not.
  4. One involves closely related organisms, and the other involves only individuals of the same species.

Hint:

B

Which variable increases the likelihood of allopatric speciation taking place more quickly?

  1. lower rate of mutation
  2. longer distance between divided groups
  3. increased instances of hybrid formation
  4. equivalent numbers of individuals in each population

Hint:

B

What is the main difference between autopolyploid and allopolyploid?

  1. the number of chromosomes
  2. the functionality of the chromosomes
  3. the source of the extra chromosomes
  4. the number of mutations in the extra chromosomes

Hint:

C

Which reproductive combination produces hybrids?

  1. when individuals of the same species in different geographical areas reproduce
  2. when any two individuals sharing the same habitat reproduce
  3. when members of closely related species reproduce
  4. when offspring of the same parents reproduce

Hint:

C

Which condition is the basis for a species to be reproductively isolated from other members?

  1. It does not share its habitat with related species.
  2. It does not exist out of a single habitat.
  3. It does not exchange genetic information with other species.
  4. It does not undergo evolutionary changes for a significant period of time.

Hint:

C

Which situation is not an example of a prezygotic barrier?

  1. Two species of turtles breed at different times of the year.
  2. Two species of flowers attract different pollinators.
  3. Two species of birds display different mating dances.
  4. Two species of insects produce infertile offspring.

Hint:

D