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Evolutionary biology

Chromosome chain makes a link

The platypus' sex chromosomes are as peculiar as its appearance. Five X and five Y chromosomes form a remarkable chain-like configuration in male reproductive cells that ensures appropriate sperm formation.

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Figure 1: Comparison of sex chromosomes.

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Carrel, L. Chromosome chain makes a link. Nature 432, 817–818 (2004). https://doi.org/10.1038/432817a

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