A Long, Narrow Hybrid Zone Exists in Europe Between the Ranges

question 65

Multiple Choice

A long, narrow hybrid zone exists in Europe between the ranges of the fire-bellied toad and the yellow-bellied toad. The persistence of this zone can be attributed to which of the following factors?

• A) Reinforcement strengthens the prezygotic barriers between the two species.
• B) Hybrid offspring have the same fitness as nonhybrid offspring.
• C) Both species travel long distances over the course of their lives.
• D) Individuals from outside the hybrid zone regularly move into the hybrid zone.
• E) None of the above

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Definitions:

Synapses

Junctions between two neurons where electrical or chemical signals are transmitted from one cell to another.

Imprinting

Formation of an attachment by an animal to one or more objects or animals at a critical period in development.

Maternal Attachment

The emotional bond that develops between an infant and their primary caregiver, crucial for the child's development and psychological health.

Chemoaffinity

The hypothesis that chemical signals guide the connections between neurons during the development of the nervous system.