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Gonjigz t1_j50wy3x wrote

Reply to comment by Bax_Cadarn in Given that reproduction is difficult or impossible when both animals have different numbers of chromosomes, how did so many species evolve to have so many different numbers of them? by MercurioLeCher

This is a very specific phenomenon though. 47 chromosomes are almost always incompatible with survival to adulthood unless the extra chromosome is a sex chromosome or a 21, and I don’t think monosomy of any of the autosomes is compatible with life.

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Bax_Cadarn t1_j50zfyj wrote

Nope, Turner's is the only nonlethal monosomy, but there are 2 more non-sexual trisomies that aren't lethal, 13 and 18 iirc.

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Gonjigz t1_j5214z5 wrote

Edward’s and Patau syndrome, both of which have more than a 90% mortality rate before 1 year of age. There are extremely rare cases of survival beyond childhood which is why I said almost always, but by and large these syndromes do not allow for survival to adulthood.

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