How is sex determined of a foetus?
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ba.by's genes dete.rmine the s.ex yourbab.y's s.ex is det.ermined at conc.eption by his or her gen.es. Emb.ryos with X.Y chrom.osomes bec.ome bo.ys, and those with X.X chromosomes beco.me gir.ls. There are 70 diffe.rent ge.nes loca.ted on the se.x chrom.osomes th.at de.fine a baby's se.x
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