Homework Answers
Horse has a diploid set of 64 chromosomes. During gametogenesis the number of chromosomes is reduced to half i.e. gamete are haploid.
So gametes of a horse will have 32 chromosomes.
Similarly the gametes of a donkey will have 31 chromosomes.
When these two mate they produce mules which have 63 (31+32) chromosomes which is neither the number of a donkey(62) nor that of a horse(64).
Mules are sterile because they cannot produce gametes. Gamete production needs a process called Meiosis which cannot occur in mules.
Meiosis cannot occur in mules because meiosis requires pairing up of similar chromosomes which are not available in mules. As a result gametogenesis will not take place and hence mules are sterile.
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