Ninachofahamu nikwamba mbegu za X yaani hizi nizamtoto wakike hukaa masaa 72,lakini mbegu za Y yaani za mtoto wakiume hizi hukaaa masaa 48 ndipo hupoteza uborawake,
Pia ikumbukwe kuwa mwanaume ana aina mbili za mbegu yaani X and Y hivyobasi mwanaume hutoa X na Y,
Ila mwananmke yeye ana XX tuu...
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