Thaum hloov cov xim ntawm lub qhov muag nyob rau hauv cov me nyuam?

Thaum koj xub coj koj tus me nyuam nyob rau hauv koj txhais tes, koj paub ntau npaum li cas koj tu txog nws. Txhua tus me nyuam - txheeb thiab tej lub thiab zoo ib yam li leej niam leej txiv. Qhov ntawd tsuas yog ib ntxiv? Yuav kom paub tseeb yuav tsum tau tsuas yog tom qab ib tug tej lub sij hawm. Pib nrog lub hli ntawm lub hnub nyoog, tus me nyuam pib hloov puab ntawm lub qhov ntswg, qhov muag, skulls. twb pom ib xyoos tom qab ntawd, yog xim dab tsi cov plaub hau yuav tsum kom meej meej tseg zoo lawm ntawm lub pob ntseg, kev hloov qhov muag xim nyob rau hauv cov me nyuam mos.

ob lub qhov muag xim

Ntau cov niam txiv xav nyob rau hauv cov nqe lus nug ntawm thaum hloov cov xim ntawm lub qhov muag nyob rau hauv cov me nyuam. Qhov no expectation yog txuam nrog ib tug lub siab xav mus kawm, mus rau leej twg zoo li ib tug pipsqueak. Qhov tseeb yog tias kev zoo sib thooj - ib tug txheeb ze lub sij hawm. Ib tug me nyuam nyob rau hauv plaub xyoo yuav ib tug ob peb ntau lub sij hawm mus hloov cov xim ntawm cov plaub hau los yog ob lub qhov muag. Qhov no yog vim tus nqi ntawm cov melanin nyob rau hauv lub cev. Nws yog tsis yooj yim sua hais raws nraim thaum hloov cov xim ntawm lub qhov muag nyob rau hauv cov me nyuam. Qhov no txoj kev yuav tshwm sim nquag los yog ib zaug xwb. Zaum no xyoo twb tawm tsam nrog peb, tab sis tsis tau txiav txim raws nraim yog vim li cas qhov no tshwm sim. Geneticists hais tias xws li dab yog txuam nrog rau adaptation. Qhov tseeb hais tias tus me nyuam muaj ib tug tsim genotype hau nws Attendance los ntawm leej niam thiab leej txiv. Nrog kev xav txog phenotype, cov theem yog tsawg vim tsis muaj kev. Nyob rau hauv tus txheej txheem ntawm txoj kev loj hlob thiab adaptation ntawm tus me nyuam muaj ib tug kev hloov ntawm ib co noob, recessive rau hom. Yog li muaj ib tug tej yam ntuj tso transformation uas tso cai rau tus me nyuam yuav tsum tau npaj kom txhij rau lub tej yam kev mob ntawm lub neej, nyob rau hauv uas nws yuav nyob. Nws yog manifested nyob rau hauv daim ntawv ntawm cov kev hloov nyob rau hauv pigmentation ntawm lub iris qhov muag xim, plaub hau, thiab lwm yam

statistics

Cov niam txiv feem ntau nug cov lus nug: "Yuav ua li cas npaum li cas yog hloov qhov muag xim ntawm tus me nyuam?" Raws li statistics, ntau tshaj 70% ntawm cov me nyuam no yuav hloov cov xim ntawm lub qhov muag ntawm tus muaj hnub nyoog ntawm lub xyoo. Qhov no txoj kev yuav tshwm sim ua ntej lawm, tej zaum tom qab. Nyob rau hauv tsis tshua muaj heev neeg mob, cov me nyuam muaj peev xwm hloov xim mus txog rau lub hnub nyoog ntawm plaub. Muaj mob thaum tus me nyuam yog ib xyoo uas muaj cov kob xiav ob lub qhov muag, thiab ces nyob rau hauv lub chav kawm ntawm lub xyoo uas lawv tig xim av. Tej zaum cov xim ntawm lub iris (qhov muag membrane) ua qhov nrog lub hnub nyoog ntawm peb lub hlis. Nws tag nrho cov nyob ntawm tus neeg tus yam ntxwv uas tus hluas kab mob. Yog li ntawd, lo lus nug ntawm thaum hloov cov xim ntawm lub qhov muag ntawm cov me nyuam, muaj yog tsis muaj ib qho tseeb lo lus teb.

yam ntxwv ntawm tus kab mob

Feem ntau cov kob ntawm lub iris tseem meej txog kom txog thaum peb los yog plaub lub hlis. Ntxiv mus, nws yuav meej yog hais tias tus me nyuam xim av ob lub qhov muag. Blue-eyed cov me nyuam yog li ib xyoos kom muaj ib tug tas mus li xim, vim hais tias tus nqi ntawm cov melanin yog qis tshaj cov uas nyob hauv cov xim av-eyed. Tag nrho cov me nyuam mos npub gray qhov muag xim. Nws yog peculiar xwb rau cov me nyuam. Raws li lawv tau hlob muaj ib tug kev loj hlob ntawm cov xim thiab lub qhov muag xim maj ua ib tug paub tseeb. Yog li ntawd, cov nqe lus nug ntawm thaum hloov cov xim ntawm lub qhov muag ntawm cov me nyuam, tsis tau teb hais.

nthuav lus tseeb

Cov me nyuam mos yeej ib txwm muaj dim ob lub qhov muag. Qhov no yog vim lawv adaptation: nyob rau hauv utero tsis muaj mus saib vim hais tias ntawm cov tsis muaj lub teeb. Tab sis tom qab yug me nyuam ntawm ib tug me nyuam rau ib lub hlis yuav ntau accustomed mus rau lub teeb ntawm hnub. Nws yog ib tug tsi ntawm ib tug paub tsis meej ntawm qhov. Ntawm no yog ib co nthuav cov lus tseeb hais txog tus iris nyob rau hauv cov me nyuam:

1. Qhov muag xim - yog tshwj xeeb! Tsis yog vim hais tias thaum ub cov neeg ntseeg lub qhov muag da dej iav. Txhua impregnation yog tshwj xeeb, zoo li cov yiv tes.
2. Feem ntau xim ntawm cov iris - xim av, thiab lub rarest - ntsuab. Nyob rau hauv tej lub teb chaws, cov neeg uas muaj ntsuab lub qhov muag pe hawm.
3. Tsawg tshaj li ib feem pua ntawm cov me nyuam muaj heterochromia - sib txawv kob ob lub qhov muag. Feem ntau cov feem ntau qhov no tshwm sim tshwm sim nyob rau cov menyuam ntxaib.
4. Geneticists ntseeg tau hais tias qhov muag xim yog kis tau raws li Mendel txoj kev cai. Yog li, yog tias cov niam txiv yog ntawm tib xim ntawm cov iris, lub progeny inherits lub tib xim. Yog hais tias cov neeg koom tes muaj ntau lub qhov muag, tus me nyuam yuav muaj nruab nrab ntxoov ntxoo.