Vanhu vane mapara mangani akafanana uye ndechipi chakasiyana?
Vanhu vane mapara 22 ehomologous kunze kwemapara 23 ayo anogona kuva akasiyana. Nhamba yechi23 inoratidza kuti murume nomukadzi ndevapi uye haifaniri kunge yakafanana. Pair 21 ndiyo dzimwe nguva ine yechitatu inokonzera chirwere cheDown.