AnswersScience 8Natural Selection

Natural Selection Answers

0 verified answers1 views
1
Free Preview

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
Free Preview

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.
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

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.
6

Which conditions are required for natural selection? Select three options.

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.
7

What occurs if the environment changes and a species is no longer able to survive?

A
The species becomes extinct.
B
The species evolves.
C
The species adapts.
D
The species is naturally selected.
8

Which are characteristics of natural selection? Select three options.

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.
9

Which causes genetic variations and can result in different alleles?

A
predation rate
B
random mutations
C
competition
D
environmental changes
10

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.

Did you find these answers helpful?

More from this Course

Quiz
10 verified answers

Natural Selection

Quiz
10 verified answers

Natural Selection

Quiz
6 verified answers

Quiz

Natural Selection Answers — Science 8