Answers SY2025-26 - 2002070 MJ Comprehensive Science 2 Sem 1 CRUnit Test

Lab: Natural Selection Answers

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

They are the only traits that ever exist in the population.

They build in the population over time.

They are rarely passed on to offspring.

They are found only in a few individuals within the population.

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

A frog living in a pond is eaten by a predator, while others in the same population survive.

A snake living in a desert produces more offspring than other snakes in the same population.

Some rabbits living in a forest have short, spotted ears, while others have long white ears.

Some birds living in a grassland eat less than other birds who eat the same food.

evolutionnatural selectionextinctionvariation

evolution

natural selection

extinction

variation

Which causes genetic variations and can result in different alleles?

predation rate

random mutations

competition

environmental changes

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.

The adaptation of thinner fur will be selected over thicker fur, and the population will remain unchanged.

The adaptation of thicker fur will be selected over thinner fur, and the population will remain unchanged.

The adaptation of thinner fur will be selected over thicker fur, and the population will evolve.

The adaptation of thicker fur will be selected over thinner fur, and the population will evolve.

Many scientists believe that dinosaurs became extinct due to

floods caused by strong storms.

a harmful genetic mutation.

the introduction of a predator.

an asteroid impact.

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?

Bright mice were not able to blend into their environment as easily as dark mice, so they did not continue to survive and reproduce.

Bright mice produced fewer offspring than dark mice, so the bright mice became outnumbered within days.

Random changes in the genetics of bright mice produced more dark mice, so the bright mice quickly died off.

Random changes in the genetics of dark mice produced fewer bright mice, so the dark mice took over the population.

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?

the introduction of new predators to the insects’ environment

a genetic mutation in an individual that causes it to be very small

a disease that causes a mother insect to die shortly after laying eggs

the introduction of a new food source to the insects’ environment

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.

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.

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

Organisms do not produce many offspring, so all of them can survive and pass on their traits.

Organisms overproduce offspring; consequently, all of them are likely to survive and pass on traits.

Organisms overproduce offspring, so only some survive and pass on their traits.

Organisms do not overproduce offspring; therefore, those that are produced will develop the best traits.

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Lab: Natural Selection Answers

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