Umbala wamehlo omntwana usenokutshintshwa ngokuhamba kwexesha. Umbala wamehlo omntwana uchongwa yinto ebizwa ngokuthi i-melanin. I-Melanin i-pigment emnyama equlethwe kwi- iris , isakhiwo esilawula ukuba kukhanya kangakanani kuvunyelwe kwiso. Umbala we-iris ukhankanywe ngumlinganiselo we-melanin kwi-iris.
Amehlo aphilileyo anemibala encinane kakhulu, kanti amehlo amnyama aninzi.
Kwiintsana, i-pigmentation inkqubo ye-iris ayigqibekanga. Iintsana ezinesikhumba emnyama zivame ukuzaliswa ngamehlo amnyama ahlale emnyama. Umbala we-Iris kwiintsana ezikhukhulayo zivame ukuba ngumbala ohlaza okwesibhakabhaka okanye umbala obomvu ngokuzalwa, kwaye utshintshe njengoko bekhula. Ukuveliswa kwemveliso yaseMelanin kunyaka wokuqala wobomi, ngokuqhelekileyo kubangele umbala omnyama, onzulu.
Uluphi Umbala Wamehlo?
Umbala ongapheliyo wamehlo awusetyenziswanga ukuba umntwana angenani ubuncinane kwiinyanga ezili-9 ubudala, ngoko ulinde de kube ngumhla wokuzalwa komntwana wakho ukufumana umbala oya kubakho. Nangona kunjalo, ngamanye amaxesha unokufumana izinto ezintle. Ukutshintsha kwemibala emfihlakeleyo kunokuqhubeka kwindlela yonke ukufikelela kwimizuzu emithathu ubudala. Ngokomzekelo, amehlo endiluhlaza ngokugqithiseleyo ajika i-hazel okanye i-hazel ingancipha ngokukhawuleza ibe mnyama. Umbala wamehlo omntwana uphenjelelwa ngumbala wamehlo wabazali bawo. Umbala wamehlo uvame ukufundiswa kwintsimi yezofuzo ngenxa yeendlela zawo zefa kodwa aqondwanga ngokupheleleyo.
Iipateni zelifa lembala yamehlo ziyinkimbinkimbi kakhulu kunezinto esizifundayo kwi-genetics eyisiseko ezifundiswa kwi-biology yesikolo esiphakeme. Umbala wokujonga umntwana wakho wokugqibela uncike kakhulu kuwe kunye neqabane lakho. Sasiyicinga ukuba loo mdaka wawunamandla kunye nohlaza okwesibhakabhaka. Kodwa isayensi yanamhlanje ibonise ukuba umbala wamehlo awukho konke okulula.
Umbala wamehlo ulawulwa zizifo zentlobo ezintathu ezisisiseko. Abaphengululi baqonda ezimbini zezo jeni kakuhle kwaye enye yazo isengummangaliso. Ezi jeni zilawula ukuphuhliswa kombala obomvu, obomdaka nombala ohlaza okwesibhakabhaka. I-Gray, hazel, kunye nezinye izinto ezidibanisa kunzima ukuqikelela
Ukubikezela Umbala Wamehlo
Nangona iziprofeto malunga nombala wamehlo akho amehlo omntwana aya kuba nawo, kukho ezinye izinto ezinamandla ongazifunda ngazo. Umzekelo, ukuba zombini umama unobumba obomvu, kodwa omnye wabo unomzali onobuhlaza obunomhlaza, ngoko unokufumana ithuba lokuba amehlo akho umntwana ahlale eluhlaza okwesibhakabhaka. Ukuba ngaba bobabini abazali banamehlo aluhlaza, ngoko kukho ihleko elihle lokuba amehlo akho umntwana ahlale eluhlaza okwesibhakabhaka. Ukuba umzali omnye unamehlo aluhlaza kunye nomnye obomdaka, amehlo akho umntwana usenokuba nethuba eli-50 lokuguqula umthunzi. Ngakolunye uhlangothi, abazali abaninzi apho umzali omnye unamehlo aluhlaza kwaye omnye unamehlo aluhlaza, abantwana banokuphelisa ngamehlo enombala obuluhlaza okanye obumnyama. Unokucinga ukuba akukho nombala wamehlo obonakala ngathi uyigenki ephezulu kangangokuba ixube elihle. Nangona kunjalo, inzululwazi ibonisa ukuba imibala yamehlo ayiphumeli njengento engqinelanayo, kodwa iimbini zeendiza ezinokudala amathuba amaninzi.
Iingcali zenzululwazi zisebenzela uvavanyo olusekelwe kuhlalutyo lwe-DNA olunokuthi luchaze umbala wamehlo.
Umbuzo uya kuba, "Ngaba kubaluleke kakhulu ukuba nje umntwana usempilweni?" Nangona kunjalo, oku kubalulekile ekuphuhlisweni kweemeko zemizimba ezichaphazela impilo yabantwana bakho.
Umthombo
UAlfred Rosenbloom, uJr. kunye noMeredith W. Morgan, iMigaqo kunye nokuSebenza kwe-Optometry yabantwana. I-JB Lippincott Inkampani, 0-397-50917-0, 1990.