Answers24 - 25 CR - Biology B 0411KBBiogeographic Isolation-Standard Bio 4.5

Biogeographic Isolation-Standard Bio 4.5 — Unit test Answers

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A population of snakes that eat small rodents enters a new habitat. In the new habitat, there are many species of rodents, and their populations are high because there are few natural predators. What will most likely be the effect on the genetic variation of the snake population?

A
Genetic variation will increase because of a selective pressure.
B
Genetic variation will increase because of a new habitat and food source.
C
Genetic variation will decrease because of a selective pressure.
D
Genetic variation will decrease because of a new habitat and food source.
23

A scientist makes the argument that she has found DNA evidence that shows that evolution does not exist. What would her evidence have to show for her to be correct?

A
Strong genetic similarities in closely related organisms and weak genetic similarities in distantly related organisms.
B
Weak genetic similarities in closely related organisms and strong genetic similarities in distantly related organisms.
C
Strong physical similarities among closely related organisms and also among distantly related organisms.
D
Weak physical similarities among closely related organisms and also among distantly related organisms.
24

A population of squirrels lived together in a forest. An event occurred that caused the population to diverge into two different species over a long period of time. Which of the following is most likely the event that occurred?

A
There was an increase in the predators in the forest.
B
A natural disaster occurred that separated squirrels.
C
The winters were unusually cold in the forest.
D
A disease affected the squirrel population in the forest.
25

Which of the following must occur for speciation to happen?

A
geographic isolation
B
reproductive isolation
C
temporal isolation
D
behavioral isolation

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