Disruptive Selection Is Described in the Text with the Case

question 26

Multiple Choice

Disruptive selection is described in the text with the case of British land snails.In the grassy fields,the light-banded snails escape bird predators.In the darker forest,the dark snails survive and the light-banded snails are eaten.As long as the snails continue to cruise across the British landscape mating at the same season and having access to each other,why doesn't this "disruptive selection" eventually lead to two separate species?

• A)There is no reproductive isolation to prevent gene flow.
• B)They are already two separate species and the intermediate forms are hybrids.
• C)The color forms are probably not genetically determined.
• D)There must be some unknown factor producing an equal stabilizing selection "to hold the species together."
• E)This will result in the formation of two species if given long enough time.

---

Definitions:

T Distribution

A probability distribution used in statistics for hypothesis testing, especially with small sample sizes or unknown population standard deviations.

T Distribution

A type of probability distribution that is symmetric and bell-shaped but has heavier tails than the normal distribution, used especially in small sample analysis.

Degrees of Freedom

The count of distinct values or quantities that can change during an analysis while still adhering to all constraints.

Normal Distribution

This refers to a probability distribution characterized by its symmetry about the mean, highlighting that data closer to the mean are encountered more frequently than data far from the mean.