AnswersCA-Integrated Science 8 BUnit Test

Unit Test — Unit test Answers

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In a mouse population, some mice have thicker fur than others, but there are more mice with thinner fur. The climate in which these mice live has slowly gotten colder.

A
The adaptation of thinner fur will be selected over thicker fur, and the population will remain unchanged.
B
The adaptation of thicker fur will be selected over thinner fur, and the population will remain unchanged.
C
The adaptation of thinner fur will be selected over thicker fur, and the population will evolve.
D
The adaptation of thicker fur will be selected over thinner fur, and the population will evolve.
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C
Cloning requires two parents and selective breeding requires one parent.
C
Cloning results in a genetically identical plant and selective breeding does not.
C
Cloning always requires that DNA be modified and selective breeding does not.
C
Cloning always results in larger plants and selective breeding always results in smaller plants.
23

Which best describes Darwin’s studies that led to the theory of evolution?

A
extensive research of an individual organism within a short period
B
extensive research of an individual organism over many years
C
observations and data collected within a short period
D
observations and data collected over many years
24

A genetic mutation causes a squirrel to be born with much darker fur than its parents.

A
Because the trait was caused by a mutation, it will not be passed on to any offspring, resulting in the disappearance of the trait.
B
Because the trait was caused by a mutation, it will be passed on to offspring over many generations, resulting in a population of darker squirrels.
C
If the trait is unfavorable, it will be passed on to offspring over many generations, resulting in a population of darker squirrels.
D
If the trait is favorable, it will be passed on to offspring over many generations, resulting in a population of darker squirrels.
25

A mutation causes a dog to be born with a tail that is shorter than normal. Which best describes this mutation?

A
It is harmful because it obviously affects the dog’s survival.
B
It is harmful because it affects the dog’s physical appearance.
C
It is neutral because it does not obviously affect the dog’s survival.
D
It is beneficial because it affects the dog’s physical appearance.

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