Video: Puas yog qhov tseem ceeb tshaj plaws ib txwm muaj?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov yam ntxwv tseem ceeb tsis yog ib txwm feem ntau.
Qee tus neeg yuav xav li ntawd qhov tseem ceeb yog cov feem ntau tej zaum yuav pom nyob rau hauv cov pej xeem, tab sis lo lus " tseem ceeb " tsuas yog hais txog qhov tseeb tias allele tau nthuav tawm dua lwm tus allele. Ib qho piv txwv ntawm qhov no yog Huntington's disease.
Hais txog qhov no, puas yog cov yam ntxwv tseem ceeb tshaj li qhov tsis txaus ntseeg?
Piav txog a qhov zoo raws li tseem ceeb tsis txhais hais tias nws yog tus feem ntau ; nws txhais tau hais tias nws yog qhia tshaj lub rov zoo li qub . Piv txwv li, tus nplaig dov yog a qhov tseem ceeb , tswj los ntawm tseem ceeb version ntawm ib qho gene (R). Cov tib neeg uas muaj ib lossis ob daim ntawv theej ntawm R yuav nthuav tawm tus nplaig dov.
Ib yam li ntawd, vim li cas tus cwj pwm zoo dua li lwm tus? Ib tug dav misconception yog hais tias yam ntxwv vim dominant alleles yog cov feem ntau hauv cov pejxeem. Txawm hais tias qhov no qee zaum muaj tseeb, nws tsis yog ib txwm muaj. Piv txwv li, allele rau Huntington's Disease yog qhov tseem ceeb, thaum lub allele rau tsis tsim cov kab mob no yog recessive.
Raws li txoj cai, yog vim li cas tej zaum qhov tseem ceeb tshaj plaws yuav tsis tshua muaj nyob rau hauv cov pej xeem loj?
Vim nws tsis zoo. Dwarfism (tsawg kawg yog hom ib txwm - achondroplasia tshwm sim los ntawm kev hloov pauv hauv FGFR3) yog tseem ceeb . Tab sis nws yog tsis tshua muaj , vim dwarfism tsis zoo.
Vim li cas cov kab mob tseem ceeb ntawm caj ces tsis tshua muaj?
Ib qho txawv txav ntawm ib qho ntawm thawj 22 nonsex (autosomal) chromosomes los ntawm leej niam leej txiv tuaj yeem ua rau autosomal. tsis meej pem . Dominant qub txeeg qub teg txhais tau hais tias ib tug txawv txav noob los ntawm ib tug niam txiv tuaj yeem ua rau kab mob . Qhov no tshwm sim txawm tias qhov sib txuam gene los ntawm lwm tus niam txiv yog qhov qub.
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