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-- during spermatogenesis, the ten sex chromosomes of the male form an alternating chain of X and Y chromosomes that recombine at the ends of consecutive chromosomes, and all the X or all the Y chromosomes are inherited together. One of the X chromosomes resembles the Z chromosome of birds, suggesting that the two sex chromosomes of marsupial and placentals evolved after the split from the monotreme lineage. Additional reconstruction through shared genes in sex chromosomes supports this

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