AnswersAISD-Biology B CR 25-26Natural Selection

Natural Selection Answers

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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
2
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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.
3

Which conditions are required for natural selection? Select three options. Populations have genetic variation.Organisms overproduce offspring.Environmental conditions remain stable.Traits are passed on to only some of the offspring.Nature selects favorable adaptations.

A
Populations have genetic variation.
B
Organisms overproduce offspring.
C
Environmental conditions remain stable.
D
Traits are passed on to only some of the offspring.
E
Nature selects favorable adaptations.
4

Organisms must have variation within a population in order for natural selection to occur.Which situation is an example of this variation?

A
A frog living in a pond is eaten by a predator, while others in the same population survive.
B
A snake living in a desert produces more offspring than other snakes in the same population.
C
Some rabbits living in a forest have short, spotted ears, while others have long white ears.
D
Some birds living in a grassland eat less than other birds who eat the same food.
5

evolutionnatural selectionextinctionvariation

A
evolution
B
natural selection
C
extinction
D
variation
6

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
7

Due to a genetic mutation, a deer is born with a missing toe. This makes it difficult for the deer to escape from predators.

A
The deer with the mutation will not survive, and the trait will disappear from the population.
B
The deer with the mutation will survive and reproduce, but it will not pass this trait on to its offspring.
C
The deer with the mutation will not survive, but the trait will appear again in the next generation.
D
The deer with the mutation will survive and reproduce, and the trait will commonly appear in future generations.
8

Which statement describes how favorable traits in a population relate to natural selection?

A
They are the only traits that ever exist in the population.
B
They build in the population over time.
C
They are rarely passed on to offspring.
D
They are found only in a few individuals within the population.
9

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.
10

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.

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