Chemicals You Were Exposed to Before Birth May Be Scrambling Your Future Children’s DNA
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During meiosis, the process by which sperm are made, chromosomes must sort themselves with extraordinary precision. Each mature sperm cell is supposed to carry exactly 23 chromosomes: one sex chromosome, either X or Y, and 22 others. When the sorting goes wrong, a sperm ends up with an extra chromosome, sometimes two sex chromosomes instead of one, sometimes none at all. Most of the time this matters little; aneuploid sperm rarely fertilise successfully. But when they do, the consequences can in
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