Bavame Kangakanani Abantu Abanezinwele Ezinombala Obomvu Namehlo Aluhlaza?

-Delile

• Umuntu uzithola kanjani izinwele ezibomvu namehlo aluhlaza okwesibhakabhaka
• Yiluphi ufuzo olubangela izinwele ezibomvu?
• Ngabe abantu abanezinwele ezibomvu, nabanamehlo aluhlaza okwesibhakabhaka bayaphela?
• Izinwele ezibomvu, amehlo aluhlaza okwesibhakabhaka kwabesilisa kuqhathaniswa nabesilisa
• Izinwele ezibomvu, amehlo aluhlaza okwesibhakabhaka, nesobunxele

Ukubuka konke

Emigqeni eminingi yemibala yezinwele zemvelo, ama-hues amnyama yiwona avame kakhulu - abantu abangaphezu kwamaphesenti angama-90 emhlabeni wonke banezinwele ezinsundu noma ezimnyama. Lokho kulandelwa yizinwele ezimhlophe.

Izinwele ezibomvu, ezenzeka kubantu nje, zivame kakhulu. Amehlo aluhlaza ngokufanayo ajwayelekile, futhi kungenzeka ukuthi ayaqabukela.

Ucwaningo oluthile lwathola ukuthi phakathi kuka-1899 no-1905, ngaphezu kwengxenye yabantu abamhlophe abangewona amaSpanishi e-United States babenamehlo aluhlaza okwesibhakabhaka. Kodwa kusukela ngo-1936 kuya ku-1951, lelo nani lehla laba ngamaphesenti angu-33.8. Namuhla, izilinganiso ziphakamisa ukuthi cishe amaphesenti ayi-17 abantu emhlabeni wonke anamehlo aluhlaza okwesibhakabhaka.

Umbala wakho wezinwele nombala wamehlo wehlela kuzakhi zofuzo ozithola njengefa kubazali bakho. Uma umuntu oyedwa enezinwele zombili ezibomvu namehlo aluhlaza okwesibhakabhaka, kunethuba elihle lokuthi omunye wabazali babo noma bobabili benze njalo, kodwa hhayi njalo.

Kufanele uzuze amafa amabili wolwazi lofuzo ngombala wakho wezinwele nombala wamehlo akho ukuze ube nalezi zici ezingavamile kakhulu. Amathuba okuthi lokhu kwenzeke akuvamile, ikakhulukazi uma kungekho noyedwa kubazali bakho onezinwele ezibomvu noma amehlo aluhlaza okwesibhakabhaka. Kwesinye isikhathi, noma kunjalo, izinkanyezi zofuzo zihambelana, futhi abantu bazalwa benenhlanganisela engavamile yezinwele ezibomvu namehlo aluhlaza okwesibhakabhaka.

Umuntu uzithola kanjani izinwele ezibomvu namehlo aluhlaza okwesibhakabhaka

Izici ze-Gene ziwela ezigabeni ezimbili: ngokweqile futhi okuphezulu. Abazali babelana ngepulani yezici eziningi, kusuka kumbala wezinwele kuye ebuntwini, kuzakhi zofuzo zabo.

Yize umbala wezinwele uthonywe izakhi zofuzo eziningi, ngokuvamile, izakhi zofuzo ezivelele ziphumelela kumakhanda ekhanda ngokumelene nezakhi zofuzo eziguquguqukayo. Izinwele ezinsundu namehlo ansundu, ngokwesibonelo, zombili zihamba phambili, yingakho akha amaphesenti amaningi kangako ezinhlanganisela zombala wezinwele namehlo.

Abazali bangaba futhi ngabathwali bezakhi zofuzo eziguquguqukayo. Ngenkathi bengabonisa izakhi zofuzo ezivelele, basenawo - futhi bangadlulisela ezinganeni zabo - izakhi zofuzo eziguquguqukayo. Isibonelo, abazali ababili abanezinwele ezinsundu, nabanamehlo ansundu bangaba nengane enezinwele ezimhlophe namehlo aluhlaza okwesibhakabhaka.

Bobabili abazali bangabonisa izici zofuzo eziguquguqukayo, futhi bangazidlulisela nasezinganeni zabo. Isibonelo, uma bobabili abazali benezinwele ezibomvu, ingane ithola ikakhulukazi imininingwane yezofuzo yezinwele ezibomvu, ngakho-ke amathuba okuba nezinwele ezibomvu acishe abe ngamaphesenti ayi-100.

Uma omunye umzali enekhanda elibomvu kanti omunye engenjalo, amathuba okuthi ingane yabo ibe nezinwele ezibomvu cishe angamaphesenti angama-50, yize umthunzi obomvu ungahluka kakhulu.

Okokugcina, uma bobabili abazali bephethe okwahlukahluka kofuzo kodwa bengenazo izinwele ezibomvu, ingane inethuba elingu-1 kwamane lokuba nezinwele ezibomvu ngempela. Iphethini yangempela yefa lezinwele umbala iyinkimbinkimbi ngokwengeziwe, kepha, njengoba kunezakhi zofuzo eziningi ezihilelekile.

Yiluphi ufuzo olubangela izinwele ezibomvu?

Ama-melanocyte amangqamuzana akha i-melanin esikhunjeni sakho. Inani nohlobo lwe-melanin olukhiqizwa ngumzimba wakho kunquma ukuthi isikhumba sakho siyoba mnyama noma sikhanye kanjani. Izinwele ezibomvu ziwumphumela wokuhluka kofuzo okwenza ukuthi amangqamuzana esikhumba somzimba namaseli ezinwele akhiqize olunye uhlobo oluthile lwe-melanin nokuncane kolunye.

Iningi lamakhanda abomvu linokushintshwa kofuzo ku-melanocortin 1 receptor (MC1R). Lapho i-MC1R ingasebenzi, umzimba ukhiqiza i-pheomelanin eningi, ebhekele amathoni wesikhumba abomvu nobomvu, kune-eumelanin, enesibopho sombala onsundu nokumnyama. Kubantu abane-MC1R esebenzayo, i-eumelanin ingalinganisa i-pheomelanin, kepha kuma-redheads, ukuhlukahluka kofuzo kukuvimbela lokho.

Ukuthi unekhophi eyodwa noma womabili we-MC1R engasebenzi kunganquma nomthunzi wezinwele ezibomvu onazo, kusuka ku-sitrobheli blonde kuya ekushiseni okujulile kuya ekubomvu okukhanyayo. Lesi sakhi sinesibopho sama-freckles kuma-redheads amaningi, futhi.

Ngabe abantu abanezinwele ezibomvu, nabanamehlo aluhlaza okwesibhakabhaka bayaphela?

Ungakholelwa ukuthi ngenxa yokuthi lezi zici zofuzo azivamile, zingahlanjululwa zivele echibini lofuzo ngokuphelele. Lokho ngeke kwenzeke. Noma ungeke ukwazi ukubona izici eziguquguqukayo - izinwele ezibomvu, ngokwesibonelo - zisekhona, zicashe kuma-chromosomes womuntu.

Lapho umuntu enengane, bangadlulisela imininingwane yabo eyeqile yocwaningo enzalweni yabo, futhi lo mkhuba ungaphumelela. Yingakho into efana nezinwele ezibomvu noma amehlo aluhlaza okwesibhakabhaka ingakwazi "ukweqa" izizukulwane futhi iveze izinyathelo ezimbalwa ezansi komugqa womndeni.

Izinwele ezibomvu, amehlo aluhlaza okwesibhakabhaka kwabesilisa kuqhathaniswa nabesilisa

Izinwele ezibomvu zivame kakhulu kwabesifazane, ngokusho. Kodwa-ke, abesilisa baseCaucasia banamathuba amaningi okuba namehlo aluhlaza okwesibhakabhaka kunabesifazane, imibukiso. Ngokuqondene nokuhlanganiswa kwezinwele ezibomvu namehlo aluhlaza okwesibhakabhaka, ucwaningo oluncane lubheke ukuthi yiluphi ucansi olunamathuba amaningi okuthuthukisa lo combo wesici ongajwayelekile.

Izinwele ezibomvu, amehlo aluhlaza okwesibhakabhaka, nesobunxele

AbakwaRedheads bayazi ukuthi umbala wezinwele zabo akuyona ukuphela kwento eyingqayizivele. Eqinisweni, ama-redheads anokunye ukuthambekela okungajwayelekile.

Umkhawulo uphakamisa ukuthi amakhanda abomvu angaba sethubeni lesokunxele. Njengezinwele ezibomvu, ukunxele kungumkhuba oguquguqukayo. E-Western hemisphere, amaphesenti ayi-10 kuye kwayi-15 abantu basebenzisa isandla sabo sobunxele kakhulu.

Ama-Redheads kucatshangwa ukuthi azwela kakhulu ebuhlungwini, futhi, imibukiso. Futhi, bangase babe nomuthi wokubulala izinzwa ngaphezulu ngesikhathi sokuhlinzwa noma i-anesthesia yendawo.

Ngenkathi ama-redheads ezalwa emhlabeni wonke, maningi amathuba okuthi atshale eNyakatho Nenkabazwe.Yize cishe u-1-2% wabantu bomhlaba jikelele benofuzo olubomvu lwezinwele, lelo phesenti lenyukela enyakatho ye-equator.