shadowyams t1_j50iajs wrote
Reply to comment by fruticosa 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
Chordates (vertebrates and a few close relatives) also went through two rounds of whole genome duplication early on in their evolutionary history (this is the 2R hypothesis, the evidence for which is pretty solid at this point), so while it's not as common or well-tolerated in our clade compared to plants, it's still something that can happen occasionally.
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