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SAT® Subject Test in Biology

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Moderate

Mules

SATBIO-KVNVG5

A donkey and a horse are able to mate and produce an offspring known as a mule. The resultant mule possesses 63 chromosomes in its cells due to the donkey parent having 62 chromosomes and the horse parent having 64. The mule is unable to mate with other mules to produce its own offspring.

Which of the following reproductive isolating mechanisms is operating in this situation?

A

Hybrid inviability

B

Hybrid mortality

C

Behavioral isolation

D

Hybrid sterility

E

Temporal isolation