A Horse Has a Diploid Number (2n) of 64 and a Donkey

question 53

Multiple Choice

A horse has a diploid number (2n) of 64 and a donkey has 2n = 62. The hybrid of these two species, mules, have 2n = 63 and are sterile. Why are mules sterile?

• A) One chromosome is unpaired and fails to divide properly during meiosis.
• B) Mules cannot physically mate with each other.
• C) Mules cannot physically mate with horses and donkeys.
• D) Horses are not able to form new species.
• E) Mules are not true hybrids.

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Definitions:

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