Why do you have two sets of chromosomes? Where did the two sets come from?

We have two sets of chromosomes because we're diploid organisms: the most obvious function of this is that two parents can mix and match their genes in (figurative) hopes of getting some optimum combination in at least some of their offspring.

Explanation: Parents had the smash and their genes were passed on.

You get one set of chromosomes from each parent. We need two sets because the Y chromosome is much smaller, it does not carry certain genes that the X chromosome has.

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