What makes it that if two species crossbreed, the baby is infertile? What makes it possible for the parents to mate in the first place?
In: 4
The uneven amount of chromosomes.
To reproduce, an animal needs to share half of its chromosomes.
For example, donkeys have 62 chromosomes and horses have 64. So a mule would get 31 from the donkey and 32 from the horse, which adds up to 63. Since this can’t divide in half, a mule can’t reproduce.
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