Uma izinyanga eziyisishiyagalolunye zokulinda zisala ngemuva, futhi nazo zinzima inqubo yokudiliva, okungaba kuhle kakhulu kunokuba ugqoke futhi ucindezele ingane yakho esanda kuzalwa! Ngomama ngamunye, imizuzu yokuqala yokubambisana nomntwana kukhunjulwa ngokuphila. Luhlobo luni lomndeni lezi zandla nezinyawo ezincane zibukeka sengathi! Ukuthakazelisa okwedlulele kumusha omusha kubangela umbala wamehlo entsheni. Abazali abaningi bafuna kusukela ezinsukwini zokuqala ukucacisa ukuthi umntwana wabo ubonakala ngombala weso.
Umbala wamehlo ezisanda kuzalwa ungashintsha phakathi nonyaka wokuqala wokuphila, futhi ngezinye izikhathi ngisho nasekupheleni kweminyaka ekhulile. Kuze kube izinyanga ezintathu ezimweni eziningi, ezinganeni, umbala wamehlo awuqinisekisiwe.
Umbala wamehlo ezisanda kuzalwa usuxhomeke ekujuleni kwe-melanin. Inani le-pigment linquma umbala we-iris iso. Uma kune-melanin eningi, umbala wamehlo uba mnyama, uma uncane-ompunga, obuluhlaza noma obuluhlaza. Kuzo zonke izingane ezisanda kuzalwa, umbala wamehlo usufana nhlobo - ompunga omncane noma ongeyena ohlaza okwesibhakabhaka. Lokhu kungenxa yokuthi i-melanin ayikho engosini yomntwana. Ukushintsha kombala wamehlo ezinsana kuqala lapho kuthuthukiswa le pigment. Le nqubo yomzimba yokwenza i-pigment melanin ngokuqondile ixhomeke ekuziphatheni komuntu ngamunye nasezizukulwaneni zakhe. Ngokuvamile usana olushintsha umbala wamehlo izikhathi eziningana. Kulokhu, ukuthuthukiswa kwe-melanin pigment kwenziwa kancane kancane, njengoba ingane ikhula. Kwezinye izimo, iris iso lizuza umbala walo wokugcina kuphela eminyakeni emithathu kuya kwine. Ngakho-ke, uma umbala wamehlo ezisanda kuzalwa ushintsha kule minyaka, akukho lutho olubi kulokhu.
Ukuthinta umbala wamehlo ezisanda kuzalwa kunenkinga enjalo yobuntwana njenge-jaundice. Lesi sifo sihambisana nokuphuza kwama-protein, okuphathelene nawo, akunakwenzeka ukucacisa umbala wamehlo. I-jaundice ezinsana zivame ukwanele. Ingane yesibindi ayifanele futhi ayikwazi ukubhekana ngokushesha nomsebenzi wayo ngokugcwele. Lokhu kubangela isikhumba esiphuphukile somntwana nokuphuza kwamaprotheni. Njengomthetho, i-jaundice idlula yodwa ezinsukwini ezimbalwa ngemva kokuzalwa. Futhi ukuvimbela okuhle ngokumelene ne-jaundice yimisebe yelanga.
Amanye amaqiniso athakazelisayo ngombala wamehlo:
- Umbala ovame kakhulu wamehlo emhlabeni wonke unobundu, kanti i-rarest - eluhlaza. Amaphesenti angaphansi kwamabili abantu bomhlaba wethu abanikazi bamehlo aluhlaza. Kwamanye amazwe e-Asia naseNingizimu Melika, amehlo aluhlaza ayitholakali kubantu;
- Amaphesenti angaphansi kweyodwa kwezinsana azalwa nge-phenomenon ebizwa ngokuthi i-heterochromia. Lokhu kusho ukuthi amehlo omntwana anemibala ehlukene;
- izakhi zofuzo zibona ukuthi umbala wamehlo ezisanda kuzalwa udluliselwa ngokomthetho kaMendel. Umthetho uthi abazali abanamehlo amnyama, cishe kuyoba khona ingane enamehlo amnyama. Abazali abanamehlo alula - izinyane elinamehlo alula. Uma abazali benemibala ehlukile, iso lomntwana osanda kuzalwa lizomelela into ejwayelekile.
Akekho isazi emhlabeni ongatshela kahle ukuthi umbala womntwana wakho osanda kuzalwa uzoba yini. Ngakho-ke, abazali bangaqagela ngalolu daba, noma balinde kuze kube yilapho izici zomuntu zibonakala, futhi umbala wamehlo uzothola umbala wokugcina.