What is natural selection?

The process by which the distribution of traits in a population changes over many generations

An idea about what might happen based on what you already know

An animal that is hunted or killed by another animal for food

A type of molecule that genes and chromosomes are made of

Which population has more guppies with large spots?

The population in Venezuela has more guppies with large spots.

They both have the same number of guppies with large spots.

The population in Brazil has more guppies with large spots.

Different versions of chromosomes

Ducks with thicker feathers are more likely to stay warm and survive in cold water. But, in warm water, thicker feathers can make the ducks overheat and die. How did the environment change between time 1 and time 2? How did the population change?

The water became warm. With each generation, more ducks with thin feathers survived long enough to pass on the gene for thin feathers to their offspring.

The water became warm. As a result, ducks with thin feathers were more likely to survive, so the ducks with thick feathers changed to have thin feathers.

The water became warm. As a result, ducks with thin feathers were more likely to survive, so both kinds of ducks passed on the gene for thin feathers to their offspring.

Scientists measured the height of the giraffes in two different populations. Which population has the largest number of tall giraffes?

The population in Somalia has the largest number of tall giraffes.

The population in Niger has the largest number of tall giraffes.

These bar graphs do not show which population has more tall giraffes.

Seals with thicker blubber are more likely to stay warm and survive in cold ocean waters. But, in warm ocean waters, thicker blubber can make the seals overheat and die. The diagrams below show three possible seal populations. If their environment changes to have warm water, which of the following seal populations will most likely survive?

Populations 1 and 2 will most likely survive.

Populations 2 and 3 will most likely survive.

Only Population 2 will survive because it is the only population with variation.

Guppies with spots that are the same size as the rocks on the bottom of the ocean are harder for bigger fish to see and catch. At time 1, the population had the same number of guppies with small and large spots. At time 2, after many generations, there were many more guppies with small spots and fewer guppies with large spots in the population. How did the population change?

The rocks became smaller. With each generation, more guppies with small spots survived long enough to pass on the gene for small spots to their offspring.

You cannot tell how the environment changed. With each generation, more guppies passed on the gene for small spots to their offspring.

The rocks became smaller. Guppies with small spots are more likely to survive, so both kinds of guppies passed on the gene for small spots to their offspring.

Lizards with shorter legs are better at climbing trees than lizards with longer legs. This makes lizards with shorter legs better at escaping from the floods that sometimes cover the islands. If their environment changes so that there are many floods each year, which of the following lizard populations will most likely survive?

Populations 1 and 2 will most likely survive.

All the populations will survive because the lizards will change the length of their legs if they need to.

Populations 2 and 3 will most likely survive.

Scientists measured the spine size of a population of cactuses found in an area in 1970. They measured the spine size of the cactus population again in 2015. Which of the statements below best describes the difference in the cactuses at the two time points?

There were more cactuses in 1970 than there were in 2015.

The cactuses in 1970 had larger spines than the cactuses in 2015.

There was more variation in spine size in 1970 than there was in 2015.

Scientists measured the spot size of all the guppies (small fish) that lived in a river 40 years ago. They measured the spot size of the guppy population again last year. When was there more variation in the spot size of guppies in the river?

There was the same amount of variation in spot size 40 years ago and last year.

There was more variation 40 years ago.

There was more variation last year.

Which of the following is an example of a mutation?

Change in eye color from brown to blue

Change in height due to nutrition

Change in hair length from cutting it

Change in skin color due to sun exposure

What can mutations lead to over time?

Increased susceptibility to diseases

No change in the genetic makeup of a population

Unit 7: Natural Selection and Evolution

Authored by Ally Vellema

Science

8th Grade

NGSS covered

Used 5+ times

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42 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is this an example of: There are about 100,000 people living in Santa Maria.

Population

Trait

Generation

Adaptive Trait

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the example of: My grandparents, my parents, then me.

Population

Trait

Generation

Adaptive Trait

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In our class histogram about height, the variation we graphed was ...

Number of Students

Height

Variation

Distribution

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In our class histogram about height, the distribution we graphed was ...

Number of Students

Height

Variation

Distribution

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Giant pandas live in broadleaf and coniferous forests with a dense understory of bamboo, at elevations between 5,000 and 10,000 feet. This is an example of ...

Environment

Population

Trait

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The blubber of a whale enables the whale to stay warm in cold ocean temperatures. What is this an example of?

Adaptive Trait

Non-Adaptive Trait

Variation

Distribution

Which organisms are more likely to reproduce?

A lizard with an adaptive trait to help him camouflage into his environment

A lizard with a non-adaptive trait to help him camouflage into his environment.

A lizard with both adaptive and non-adaptive traits.

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Unit 7: Natural Selection and Evolution

What is this an example of: There are about 100,000 people living in Santa Maria.

What is the example of: My grandparents, my parents, then me.

In our class histogram about height, the variation we graphed was ...

In our class histogram about height, the distribution we graphed was ...

Giant pandas live in broadleaf and coniferous forests with a dense understory of bamboo, at elevations between 5,000 and 10,000 feet. This is an example of ...

The blubber of a whale enables the whale to stay warm in cold ocean temperatures. What is this an example of?

Which organisms are more likely to reproduce?

True or False: A population can be described by the traits present and by the number of individuals who have each trait.

True or False: The number of individuals in a population always stays the same.

True or False: Over many generations, individuals with adaptive traits become more common and individuals with nonadaptive traits become less common.

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