AnswersAISD-Biology B CR 25-26Natural Selection

Natural Selection Answers

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The mice living in an area changed from having brightly colored fur to having darkly colored fur.How did natural selection most likely result in this evolutionary change?

A
Bright mice were not able to blend into their environment as easily as dark mice, so they did not continue to survive and reproduce.
B
Bright mice produced fewer offspring than dark mice, so the bright mice became outnumbered within days.
C
Random changes in the genetics of bright mice produced more dark mice, so the bright mice quickly died off.
D
Random changes in the genetics of dark mice produced fewer bright mice, so the dark mice took over the population.
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evolutionnatural selectionextinctionvariation

A
evolution
B
natural selection
C
extinction
D
variation
3

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.
4

Many scientists believe that dinosaurs became extinct due to

A
floods caused by strong storms.
B
a harmful genetic mutation.
C
the introduction of a predator.
D
an asteroid impact.
5

Which are characteristics of natural selection? Select three options. It affects populations.It affects only individuals.It occurs when there is genetic variation.It occurs when organisms are genetically identical.It selects organisms with certain traits to survive.It selects organisms at random to survive.

A
It affects populations.
B
It affects only individuals.
C
It occurs when there is genetic variation.
D
It occurs when organisms are genetically identical.
E
It selects organisms with certain traits to survive.
F
It selects organisms at random to survive.
6

Which statement best describes how reproduction leads to natural selection in a population?

A
Organisms do not produce many offspring, so all of them can survive and pass on their traits.
B
Organisms overproduce offspring; consequently, all of them are likely to survive and pass on traits.
C
Organisms overproduce offspring, so only some survive and pass on their traits.
D
Organisms do not overproduce offspring; therefore, those that are produced will develop the best traits.
7

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.
8

If there are only a few remaining members of an insect species living in one area, which would most likely cause this species to become extinct?

A
the introduction of new predators to the insects’ environment
B
a genetic mutation in an individual that causes it to be very small
C
a disease that causes a mother insect to die shortly after laying eggs
D
the introduction of a new food source to the insects’ environment
9

A species of butterfly lives in a warm climate. The butterflies feed on the nectar of tropical flowers. Birds eat the butterflies, and they prefer to eat the butterflies with brighter wings.

A
a mutation resulting in darker wings
B
a decrease in the birds that eat the butterflies
C
the destruction of the butterflies’ environment
D
overproduction of butterfly offspring
10

Which causes genetic variations and can result in different alleles?

A
predation rate
B
random mutations
C
competition
D
environmental changes

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