Members of the Cnidarian Class __________ Never Have a Medusa

question 27

Multiple Choice

Members of the cnidarian class __________ never have a medusa stage.

• A)Mesozoa
• B)Hydrozoa
• C)Scyphozoa
• D)Anthozoa
• E)Cubozoa

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Definitions:

Sexual Isolation

A mechanism of evolutionary divergence where different species or populations can no longer interbreed due to behavioral or genetic barriers.

Gametic Isolation

A prezygotic barrier where gametes (egg and sperm) of different species are incompatible, preventing fertilization.

Mechanical Isolation

A form of reproductive barrier where differences in the size and shape of reproductive organs prevent mating between species.

Sympatric Speciation

The evolution of a new species within the same geographic region as the parental species. Compare with allopatric speciation.