Nondisjunction: Ua tsis tiav ntawm cov chromosomes sib cais (kom disjoin) thaum lub sijhawm faib ntawm tes, kom ob qho tib si chromosomes mus rau ib tus ntxhais cell thiab tsis mus rau lwm tus. Nondisjunction ua rau yuam kev hauv chromosome tooj, xws li trisomy 21 (Down syndrome) thiab monosomy X (Turner syndrome).
Qhov tsis muaj kev cuam tshuam tshwm sim hauv Turner syndrome?
Qhov ntawd txhais tau hais tias tus poj niam uas muaj tus mob Turner yuav tsum tau txais nws ib leeg X los ntawm nws niam. Nws tsis tau txais kev sib deev chromosome los ntawm nws txiv, uas qhia tias kev tsis sib haum xeeb tshwm sim hauv nws. Qhov kev tsis sib haum xeeb tuaj yeem tshwm sim ntawm yog MI lossis MII.
Puas yog Turner's syndrome tshwm sim los ntawm kev tsis sib haum xeeb hauv meiosis?
Nondisjunction tej zaum yuav tshwm sim thaum lub sij hawm meiosis I los yog meiosis II. Aneuploidy feem ntau ua rau muaj teeb meem loj xws li Turner Syndrome, ib qho monosomy uas cov poj niam yuav muaj tag nrho lossis ib feem ntawm X chromosome. Monosomy rau autosomes feem ntau yog tuag rau tib neeg thiab lwm yam tsiaj.
Turner's syndrome tshwm sim li cas?
Turner syndrome yog tshwm sim los ntawm ib feem lossis ua tiav (monosomy) ntawm chromosome thib ob deev. Chromosomes muaj nyob rau hauv lub nucleus ntawm tag nrho cov hlwb ntawm lub cev. Lawv nqa cov yam ntxwv ntawm caj ces ntawm txhua tus neeg thiab lawv tuaj ua khub. Peb tau txais ib daim ntawv los ntawm txhua tus niam txiv.
Puas yog Turner's Syndrome tshem tawm lossis tsis ua txhaum?
Turner syndrome tshwm sim los ntawm a tshem tawm lossis tsis ua haujlwm ntawm ib qho X chromosome hauv poj niam. Kwv yees li ib nrab ntawm cov neeg uas muaj tus mob Turner muaj monosomy X (45, XO).
