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In other words, rather than a single chromosome pair, platypuses have a set of ten-chromosomes that determine their sex. Trending Latest Video Free. Another intriguing discovery from the study is that the ten chromosomes form chains during the sort of cell division that creates sperm or eggs. One in 16 US women were forced into having sex for the first time Albatrosses strapped with sensors help spy on illegal fishing boats. Very few other mammals are known to have more than two sex chromosomes. The researchers worked out the make-up of platypus sex chromosomes by using fluorescent markers to stain chromosomes in platypus cells before examining them under a microscope.

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