Vanhu vari panjodzi nekudzivirira trisomy 21 (Down syndrome)
- Kuva nepamuviri pakuchembera. Mukadzi ane mikana yakawanda yekuzvara mwana ane Down's syndrome paanenge achikura. Mazai anogadzirwa nevakadzi vakuru ari panjodzi huru yekukonzera kusagadzikana mukugovaniswa kwemakromosomes. Nokudaro, pazera ramakore 21, mikana yokubereka mwana ane Down's syndrome i35 mu21. Pa1, ivo 400 mu45.
- Kuzvara mwana ane Down's syndrome kare. Mukadzi akabereka mwana ane Down's syndrome ane 21% panjodzi yekuva nemumwe mwana ane Down's syndrome.
- Iva mutakuri weiyo Down syndrome translocation gene. Zvizhinji zvezviitiko zveDown's syndrome zvinokonzerwa netsaona isiri yenhaka. Nekudaro, chikamu chidiki chezviitiko zvinopa njodzi yemhuri yerudzi rwetrisomy 21 (translocation trisomy).