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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?

1443 upvotes

367 upvotes

Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
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?	1443
Is there any difference in efficacy when a vaccine is administered somewhere other than the upper arm (e.g. on the foot)?	367