Vanhu vane vhudzi rakatsvuka vanogona kurarama kwenguva refu kana vachidzidza chokwadi nezvemajeni avo ...
Vanhu vanonyatsove nemafungiro evechiduku husingaperi, asi kusvika ikozvino hazvina kumbokwanisika kuwana tsanangudzo yekuti sei panguva imwechete imwechete vanhu vose vakatarisa zvakasiyana. Kazhinji kacho, kutarisa kwevechidiki uye hutano hwakanaka mumakore makumi mashanu nemakumi matanhatu hunotsanangurwa nehutano hwakanaka hwekurara nehutano hwakanaka, asi izvi hazvisi zvechokwadi. Kune mienzaniso yakawanda iyo vanhu vane tsika dzinokuvadza uye hurongwa hukuru hwekushanda hunova nguva refu. Saka chii chakavanzika chevechidiki ipapo? Masayendisiti akawana mhinduro kumubvunzo uyu: iri mune izvo zvinonzi "tsvuku" gene.
Chii chinonzi "girafu" jena?
Kufambira mberi pakunzwisisa kuti nei vamwe vanhu vakakwanisa kutarisa nzira yose kunyange muhuchembera, masayendisiti akawana kuburikidza nekudzidza DNA yevanhu. Muchecheti yekodhi yemunhu mumwe nomumwe, chirwere cheM MC1R chinorayirwa, icho chinokonzera kuchengetedza muviri kubva pamirairo ye ultraviolet. Uyu ndiwo mazairo anokonzera kukwegura kweganda: kuonekwa kwemakwenzi, kuoma uye kuchenesa mavara. MC1R inoderedza kukuvadza kwayo kune epidermis, saka ganda rekunze rekunze rinowanikwa nevanhu pedyo ne50, uye kwete makore gumi. Kuwanikwa kunoshamisa kwegeni iri ndeyevasayendisiti paYunivhesiti yeErasmus muNetherlands.
Sechikamu chekudzidza kwavo, vanachiremba vakatora DNA miedzo muvanhu 2 693 uye vakaitawo dermatological kuongororwa kweganda ravo kuti vaone kana vakatarisa vaduku kupfuura vezera ravo chaivo. Mumaketani emagetsi avo avo vanga vanga vasingadi kuteerera mitemo yekukwegura kwepanyama, uye MC1R yakawanikwa. Izvo jena ndiro rinokonzera ruvara rutsvuku-ndicho chikonzero chainzi "girafu" jena.
Utano hunoenderana sei nemuvara-maitiro?
Izvi zvinoreva here kuti vanhu vatsvuku vane bvudzi vane tsvina vanogara vachitarisa zviri nani kupfuura vezera ravo? Zvechokwadi, hongu. Mamiriro eganda ravo kweanenge makore maviri "masaga" ekukwegura kubva mumasikati-bvudzi uye blondes. Apo zvakaitika, vamiririri veYunivhesiti vakasarudza kupfuurira mberi tsvakurudzo kuti vaone kuti chii chichava kukwegura kwevanhu vane mamwe mvere dzvudzi uye ganda pasina mavara.
Purofesa Ian Jackson akakwanisa kuongorora zvesayenzi kuti vanhu vane mavara akachena uye vhudzi rutsvuku vachaona zviri nani mukukwegura kupfuura mabhanuni akachena. Vanofanirawo kunge vane bhuruu, mawere kana mavara mavara kuti vanyatsopindirana ne "pale" ruvara. Iyi tsvakurudzo inotsvakurudza masayendisiti inonzi "kuedza kwezera rinoratidzika."
Ian anoti:
"Nhanho inotevera ndiyo kusikwa kwechimwe chinhu chingaita kuti geni rive revanhu vose, asi kusvikira zvino ruzivo rwakadaro harwuwanikwi kwatiri."
Vatsvakurudzi vechokwadi havagoni kunyatsonzwisisa nheyo ye MC1R gadziriro ye "gadzi" uye "kuisa" iyo kubva kune chinyorwa chemajini akafanana. Asi ivo vanoziva kuti munguva pfupi ivo vachakwanisa kugadzira mishonga, mushure mokunge munhu wose achatarisa muduku uye akanaka.