Natural Selection CJ Review

Match the following

• Any difference in traits between individual organisms

• Variation

• A trait that makes it less likely that an individual will survive in a specific environment

• Distribution

• The number of individuals with each trait in a population

• Non-Adaptive Trait

• A trait that makes it more likely that an individual will survive in a specific environment

• Population

• A group of the same type of organism living in the same area

• Adaptive Trait

Tags

NGSS.MS-LS3-1

NGSS.MS-LS4-4

Which histogram shows no variation in the population?

• A

• B

• C

• D

Answer explanation

Remember, variation means the number of traits available in the population- C is the only histogram with only ONE option for traits, meaning there is NO variation.

Which histogram shows the most common trait as low fur level?

• A

• B

• C

• D

Answer explanation

Remember, this histogram reads from lowest fur level to highest on the x-axis, and the low levels have the highest bars. This means most of the ostrilopes have a low fur level, so it's the most common trait.

What would happen to Population C if the environment became VERY HOT?

• There would be no change in the population

• They would probably all die because they ALL have medium fur levels- too much fur for a hot environment!

• They would all lose their fur to adapt to the hot environment

• The current generation of ostrilopes would die, but their offpsring would be born with less fur

Answer explanation

They would probably all die, because they have no variation. None of the ostrilopes have an adaptive trait for a hot environment in population C, so they would die.

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-4

NGSS.MS-LS4-4

Which histogram is most likely to have NO survivors no matter how the environment changes?

• A

• B

• C

• D

Answer explanation

Remember, C has the least amount of variation. This means it has the least amount of adaptability if the environment changes- none of the ostrilopes in the population have low OR high fur, so if it gets warmer OR colder, they're kinda screwed!

Tags

NGSS.MS-LS2-4

Which histogram is most likely to have survivors no matter how the environment changes?

• A

• B

• C

• D

Answer explanation

Remember, B has the most variation. The more variation your population has the easier it can adapt to a change in the environment.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Which of the following TWO answers is true of adaptive traits?

• They make it more likely an organism will survive

• They make it less likely an organism will survive

• They make it less likely an organism will reproduce

• They make it more likely an organism will reproduce

Tags

NGSS.MS-LS1-4

NGSS.MS-LS4-4

Which of the following TWO answers is true of non-adaptive traits?

• They make it more likely an organism will survive

• They make it less likely an organism will survive

• They make it less likely an organism will reproduce

• They make it more likely an organism will reproduce

Tags

NGSS.MS-LS4-4

Which histogram shows NO VARIATION in Generation 36?

• A

• B

• They show the same amount of variation

Answer explanation

Remember, only one bar means no variation!

Tags

NGSS.MS-LS3-1

NGSS.MS-LS4-4

The starting populations were the same. Why aren’t the populations the same in Generation 36?

• There are no carnithons in Population A, so there was nothing to eat the non-camuoflaged ostrilopes. There are carnithons in Population B, so the carnithons ate all the non-camuoflaged ostrilopes.

• The ostrilopes decided to all turn green in Population B because it is an adaptive trait

• The ostrilopes all randomly had green babies

Answer explanation

Remember, whether or not a trait is adaptive depends on the environment!

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-4

NGSS.MS-LS4-4