How did not crossing over between sex chromosomes selected? Understandable that X and Y (or Z and W) aren't identical but does it pose complications in chromosomal segregation during meiosis? Also, is it a cause (or consequence) of heterochiasmy in several species (one sex has higher meiotic recombination than the other) or achiasmy (one sex has no recombination - mostly heterogametic one)?

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