Down syndrome tshwm sim li cas thaum lub sij hawm meiosis?
Down syndrome tshwm sim li cas thaum lub sij hawm meiosis?

Video: Down syndrome tshwm sim li cas thaum lub sij hawm meiosis?

Video: Down syndrome tshwm sim li cas thaum lub sij hawm meiosis?
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Down's syndrome yog qhov tshwm sim ntawm ib daim ntawv luam ntxiv ntawm tag nrho, lossis ib feem tshwj xeeb, ntawm chromosome 21. Qhov no ua rau peb ib feem lossis tiav cov ntawv luam ntawm chromosome, tseem hu ua trisomy 21. Ob leeg. mob mitosis thiab meiosis koom nrog kev txiav txim faib ntawm chromosomes los tsim cov menyuam ntxhais.

Hauv qhov no, Down syndrome tshwm sim hauv meiosis li cas?

Qhov ntxiv chromosome 21 khoom uas ua rau Down syndrome tej zaum yuav yog vim Robertsonian translocation. Cov tib neeg nrog qhov kev npaj chromosomal no muaj 45 chromosomes thiab yog phenotypically li qub. Thaum meiosis , chromosomal arrangement cuam tshuam nrog kev sib cais ntawm chromosomes.

Ib tug kuj yuav nug, puas yog Down syndrome tshwm sim los ntawm kev ntxig? Down syndrome Kuj tseem tuaj yeem tshwm sim thaum ib feem ntawm chromosome 21 txuas nrog (txuas mus) mus rau lwm tus chromosome, ua ntej lossis thaum xeeb. Cov menyuam yaus no muaj ob daim qauv ntawm chromosome 21 ib txwm, tab sis lawv kuj muaj cov khoom siv caj ces ntxiv los ntawm chromosome 21 txuas rau lwm chromosome.

Cov lus nug tseem yog, puas yog Down syndrome tshwm sim hauv meiosis 1 lossis 2?

Kev tsis sib haum xeeb tshwm sim thaum homologous chromosomes ( meiosis Kuv) los yog tus muam chromatids ( meiosis II ) tsis sib cais thaum lub sij hawm meiosis . Feem ntau trisomy yog chromosome 21, uas ua rau Down syndrome.

Nondisjunction ua rau Down syndrome li cas?

TUG 21 ( NONDISJUNCTION ) Down syndrome feem ntau yog ua rau los ntawm qhov yuam kev hauv kev faib cell hu ua kev tsis sib haum xeeb .” Kev tsis sib haum xeeb ua rau lub embryo nrog peb daim ntawv theej ntawm chromosome 21 es tsis txhob siv ob qho tib si. Ua ntej los yog thaum xeeb tub, ib khub ntawm 21st chromosomes nyob rau hauv cov phev los yog lub qe tsis cais.

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