Chii chinoratidza ziso ruvara?

Sevana nhaka ziso ruvara? Zvinoita here kufungidzira kuti zvichave zviri mwana? Nei vakaita albinos rwepingi? Kana vabereki vaviri vane maziso shava, ipapo kana kuzvarwa, zvitema achishamisika mbudzana? Sei Ruvara Iris? Mibvunzo iyi inoshandawo nguva dzose. Response kwavari huri zvachose mupfungwa uye kwokunze zvaidiwa muviri yakaumbwa pachishandiswa genotype uyewo awana munhu kukura. Zvinorevei izvi, uye chii chinoratidza kuti ruvara womunhu ziso?

mamirire Izvi pakutsvaga pigmentation pakati Iris (Iris) zvinosanganisira ectodermal (chinjika) uye mesodermal (pamberi) akaturikidzana. Kureva kuti, ruvara yevanhu ziso kunoenderana hunhu kuparadzira fustsina (zvinobatsira kubereka nokuona ruvara absorbs chiedza uye chinonditadzisa ayo nounzenza uye kufungisisa, zvichiguma nani tinoshandisa vanhu kuona mufananidzo) mu ruvara masero backsheet uye rwe-melanin (dzinongoitika rima nyaya) ari ruvara tubhokisi uye chiedza-kufungisisa masero (chromatophores) nechemberi rukoko. On the ruvara iri kukanganiswa mamiriro ari Iris midziyo uye fibers, yakasiyana nhamba uye zvakaita ruvara, izvo anosarudza Genet. Ziso ruvara kunokonzerwa magene. Asi kwete vose vainzwisisa.

Melanin, ndiye fuma yechitema, zvinokanganisawo kwete chete sedare kwameso, asiwo bvudzi uye ganda zvenzwi. Asi, chii chinoratidza kuti ruvara meso? The zvakawanda rwe-melanin huri mesodermal layer iri rakashata kuti maziso, uye vashoma riri kuparadzirwa munzvimbo ruvara masero ari Anterior rukoko pakati Iris, ari kupenya ndizvo. Pane kuti melanin shava uye dema (kana eumelanin), yellow (kana pheomelanin). Nokuti hunhu uye uwandu iyi rwokuzvarwa fuma uye kuparadzirwa kwayo anoenderana nedzimwe magene. Somugumisiro, dziberekane pamusoro Iris angava yebhuruu, nezvakarukwa zvitema, kuchena, mutema, rinopenya, Marsh, Carey kana dema. Mwana nhaka kufanana ne mubereki ane chikuru zviratidzo (brown, chiedza mashava uye girini) uye haana kuwana ruvara pemaziso mubereki pamwe recessive Maitiro (zvitema kana vachena).

At yebhuruu maziso shure rukoko iri mavara yebhuruu nokuda vascular kuumbwa collagen fibers, pamberi rukoko ane risingamboshandisi zviri rwe-melanin. Blue vakasiyana whitish yebhuruu yakakwirira arambe achirema pamusoro fibers: dzakanga dziri arambe achirema, ari kupenya pakati Iris. Gray ziso ruvara imhaka mukuru arambe achirema kuti collagen. The pamberi paiva shoma zvakasvibirira kuti melanin nokuda yebhuruu coloring rukoko chinjika Iris iri inhomogeneously manyoro uye siyana hues. Chii chinoratidza sedare rinopenya maziso? The ruvara lipofuscin chendangariro dzavo dzakafanana ruvara. With mwero rwe-melanin tigutsikane kuruvazhe Kamudzira weziso kuva doro kana walnuts. Brown vari apo chromatophores zvine yakawanda rwe-melanin. Nokuti nhema dzinoratidzwa mukuru zviri ruvara, iro zvachose absorbs chiedza. Ari Albino ndiye vasipo, uye kuti Iris ikaonekwa Pink kana tsvuku nokuda kuratidzwa noruvara midziyo ropa.

Vachangoberekwa vane zvitema Iris, asi zvinogona rima pamusoro mashomanana akatevera. Nei izvi uye chii chinoratidza kuti ruvara mwana meso? The rwe-melanin mumuviri nenguva kuzvarwa mudumbu haina kunyatsobudirira, sezvo isina kunodiwa kusvikira iyoyo, UV dziviriro, iro rinoitwa pakati kwasviba ruvara. Chinangwa charo chikuru - ndiko kudzivirira kukuvara nemwaranzi kuti muviri wacho munyama. Pashure aberekwa, hunotanga kugadzirwa rwe-melanin nokuda unyanzvi masero (melanocytes). Naizvozvo, ruvara ziso wemwana vechokwadi hazvigoni kutsunga kwokutanga pane makore matatu, kunyange zvazvo kuchinja dzimwe nguva kusvika makore 10-12. Vakuru vanogonawo kuchinja Ruvara Iris pasi nemadhiragi kana nemhaka kurwara. Somuenzaniso, pane yellowish dziberekane nokuda kuunganidza lipofuscin.

Kazhinji kuonekwa nemaziso rave mashava, uye rima yebhuruu - recessive. Asi sayenzi yemazuva ano vakaratidza kuti hazvina kudaro nyore. The zvasviba noruvara, ndipo pariri kunodzora: Brown pamusoro mutema, mutema pamusoro mutema. Asi kwete nguva dzose kuva mwana shava achishamisika kana maziso kubva Mhamha naDhedhi mashava. In vana, zvinogona kuva zvakasiyana. Kazhinji ichi kunokonzerwa vainyeperwa kukura ruvara chokufambisa, zvomunharaunda kunotevera, kana ari mudumbu kana nguva pfupi vazvarwa, uyewo majini chirwere.