Disruptive Selection Is Described in the Text with the Case

question 55

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,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:

Diathermy

A medical treatment that uses heat generated by electric current to stimulate or heal tissues.

Transducer

A device that converts one form of energy to another, commonly used in various fields including medical diagnostics.

Paraffin Bath

A therapeutic treatment that uses warm paraffin wax to relieve pain, stiffness, and inflammation in the joints, often used in physical therapy.

Mineral Oil

A colorless and odorless oil obtained from petroleum and used as a laxative, moisturizer, or lubricant.