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wheatgrass_feetgrass t1_j50kn4u 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

The sex chromosomes are unique though. The X chromosome is the only chromosome that is almost fully functional whether there's 1 or more copies. The Y chromosome is not necessary for life, though it does serve a function besides "make boy", as missing it or duplicating it is not a side effect free situation as in XO and XYY like you pointed out.

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