Mating a male donkey to a female horse produces mules. Horses have 64 chromosomes and donkeys have 62 chromosomes. How many chromosomes do mules have? Why are they sterile?

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    The mule has 63 chromosomes and is sterile because the chromosomes cannot pair properly at metaphase of meiosis I.
    The mule has 63 chromosomes and is sterile because the chromosomes cannot pair properly at metaphase of meiosis II.
    The mule has 126 chromosomes and is sterile because 126 chromosomes are too many to go through meiosis.
    The mule has 64 chromosomes, as does its mother. It is sterile as a result of mutations that prevent sperm production.

asked May 30, 2013 in Biology by anonymous
    

1 Answer

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The mule has 63 chromosomes and is sterile because the chromosomes cannot pair properly at metaphase of meiosis I.
answered May 31, 2013 by Bioshare ~Top Expert~ (34,070 points)

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