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What is it?

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The article cited 63 chromosomes being unable form haploid germ cells as the reason mules are sterile; I believe it could caused by a trisomy, which would make it 64 chromosomes. In humans, several trisomies are survivable, so it would be possible for a live birth like this.

It would be fun to have a test tube of the babies blood. That should answer how it happened and I'm surprised the article didn't address the little ones chromosomes.

Just aman

The initial test apparently was just a blood comparison, that wouldn't show the karyotype.

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