Dab tsi cuam tshuam yog trisomy ntawm chromosome 21?
Dab tsi cuam tshuam yog trisomy ntawm chromosome 21?

Video: Dab tsi cuam tshuam yog trisomy ntawm chromosome 21?

Video: Dab tsi cuam tshuam yog trisomy ntawm chromosome 21?
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Kwv yees li 95 feem pua ntawm lub sijhawm, Down syndrome yog tshwm sim los ntawm trisomy 21 - tus neeg muaj peb daim ntawv theej ntawm chromosome 21, es tsis txhob ntawm ob daim ntawv ib txwm, nyob rau hauv tag nrho cov hlwb. Qhov no yog tshwm sim los ntawm qhov txawv txav ntawm tes thaum lub sij hawm kev loj hlob ntawm cov phev cell los yog qe cell. Mosaic Down syndrome.

Hais txog qhov no, pes tsawg chromosomes nyob rau hauv trisomy 21?

Tab sis qee zaum qhov yuam kev tshwm sim thaum lub 46 chromosome ua tau muab faib ua ib nrab. Lub qe los yog phev cell yuav khaws ob daim ntawv luam ntawm chromosome tooj 21, tsis yog 1 daim ntawv xwb. Yog tias lub qe no los yog phev fertilized, tus me nyuam yuav muaj 3 daim ntawv ntawm chromosome tooj 21. Qhov no hu ua trisomy 21.

Tsis tas li ntawd, vim li cas trisomy 21 yog qhov feem ntau ntawm tib neeg chromosome abnormality? Feem ntau cas ntawm Down syndrome tsis tau qub txeeg qub teg. Thaum tus mob tshwm sim los ntawm trisomy 21 , cov chromosomal abnormality tshwm sim raws li ib qho kev tshwm sim random thaum lub sij hawm tsim cov qe menyuam hauv niam txiv. Cov kev txawv txav feem ntau tshwm sim hauv qe qe, tab sis qee zaus nws tshwm sim hauv cov phev hlwb.

Kuj paub, chromosome 21 trisomy yog dab tsi?

Kuj tseem hu ua Down syndrome , trisomy 21 yog ib yam kab mob uas tshwm sim los ntawm ib qho ntxiv chromosome . Cov me nyuam feem ntau tau txais 23 chromosomes los ntawm txhua tus niam txiv, rau tag nrho ntawm 46 chromosomes . Cov me nyuam nrog Down syndrome txawm li cas los xij, xaus nrog peb chromosomes ntawm txoj hauj lwm 21 , hloov ntawm ib txwm khub.

Vim li cas chromosome 21 Down syndrome?

TXIV 21 (NONDISJUNCTION) Down syndrome feem ntau yog tshwm sim los ntawm kev ua yuam kev hauv cell division hu ua "nondisjunction." Nondisjunction ua rau lub embryo nrog peb daim ntawv luam ntawm chromosome 21 es tsis txhob ob li ib txwm. Ua ntej los yog thaum conception, ib khub ntawm 21st chromosomes nyob rau hauv cov phev los yog lub qe tsis cais.

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