The platypus holds the record among mammals for having the most sex chromosomes, with females possessing five pairs of X chromosomes (X1-X5) and males having five X and five Y chromosomes; during male meiosis, these 10 chromosomes form a unique alternating chain structure (X1-Y1-X2-Y2-X3-Y3-X4-Y4-X5-Y5), and this system shares more similarities with birds than with eutherian mammals, suggesting the mammalian XY sex chromosome system evolved after the monotreme lineage diverged.
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Platypus sex chromosomes' recordAdded:
Did you know that the platypus sex chromosomes are a record? While humans make do with a single pair of chromosomes to determine sex, sex for female is Y, for male the platypus holds the record among all mammals having no fewer than 10. Females have five pair of X chromosomes from X1 to X5, while males possess five X chromosomes and five Y chromosomes. Astonishingly, during male meiosis these 10 chromosomes join together to form a giant complex alternating chain, X1 Y1, X2 Y2, and so on.
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