Thaum lawv yug los, cov menyuam ntxaib zoo tib yam sib koom tib DNA, uas piav qhia vim li cas lawv feem ntau zoo nkaus li zoo ib yam. … Cov kwv tij ntxaib tsis sib koom tib yam DNA. Qhov tseeb, lawv sib koom tsuas yog ib nrab ntawm tib cov noob. Qhov no yog vim li cas cov kwv tij ntxaib feem ntau tsis zoo ib yam li cov kwv tij thiab cov muam.
Yuav ua li cas cov menyuam ntxaib tsis zoo ib yam?
Vim qhov tshwm sim ntawm ib puag ncig, cov tshuaj hu ua "epigenetic cov cim" txuas rau chromosomes thiab tuaj yeem tig cov noob tshwj xeeb rau lossis tawm. Yog li cov menyuam ntxaib zoo ib yam nrog DNA zoo ib yam tuaj yeem muaj cov noob sib txawv, ua rau lawv saib thiab ua txawv, thiab txawm tsim cov kab mob sib txawv xws li mob qog noj ntshav.
ntxaib uas tsis zoo li cas?
Cov menyuam ntxaib uas tsis zoo ib yam tseem hu ua tus menyuam ntxaib lossis cov menyuam ntxaib dizygotic (los ntawm ob lub zygotes, qhov peb hu ua qhov ntxov tshaj plaws embryo thaum lub qe thiab phev fuse).
Niam ntxaib 100% zoo ib yam?
Nws muaj tseeb zoo tib yam ntxaib sib koom lawv DNA code rau ib leeg. Qhov no yog vim cov menyuam ntxaib zoo tib yam tau tsim los ntawm tib cov phev thiab qe los ntawm lawv txiv thiab niam. (Qhov sib txawv, cov menyuam ntxaib yog tsim los ntawm ob lub phev sib txawv thiab ob lub qe sib txawv.)
Vim li cas tus ntxaib zoo ib yam zoo ib yam?
Vim cov menyuam ntxaib zoo ib yam los ntawm ib qho zygote uas sib cais ua ob, lawv muaj tib cov noob zoo tib yam- raws nraim tib daim ntawv qhia. Lawv yuavob leeg muaj ib lub qhov muag thiab plaub hau xim tib yam, thiab yuav zoo tib yam.
