Faith! Glad to see you back, my favorite adversary.
You seem to have a lot of questions concerning chromosomes at the moment. May I offer the humble suggestion you read this book, it would help with some of the answers:
Genome: The Autobiography of a Species in 23 Chapters by Matt Ridley.
You don't have to buy it, any decent library should have it available for loan for free.
One of my top ten, but what would I know about books?
P.S. - As a knowledge junkie, I have returned to grad school, most likely on a permanent basis, so when the time comes, I probably won't be around to argue with you. Sorry
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Read not to contradict and confute, not to believe and take for granted, not to find talk and discourse, but to weigh and consider. - Francis Bacon