Natural Selection

Question 10 • AISD-Biology B CR (25-26)

A genetic mutation causes a squirrel to be born with much darker fur than its parents.

Answer

Because the trait was caused by a mutation, it will not be passed on to any offspring, resulting in the disappearance of the trait.

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.

If the trait is unfavorable, it will be passed on to offspring over many generations, resulting in a population of darker squirrels.

If the trait is favorable, it will be passed on to offspring over many generations, resulting in a population of darker squirrels.

Explanation

A mutation can create a new inherited trait, but it does not automatically spread through a population. If darker fur helps squirrels survive or reproduce, those squirrels may have more offspring and pass the trait on, making darker fur more common over generations. So the best choice is “If the trait is favorable...”

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