1 NONDISJUNCTION Nondisjunction Nondisjunction Feem ntau ntawm cov teeb meem tshwm sim los ntawm kev tsis sib txuas thaum lub sij hawm niam txiv meiosis I. Trisomy tshwm sim nyob rau hauv tsawg kawg yog 0.3% ntawm cov menyuam mosthiab nyob rau hauv ze li ntawm 25% ntawm spontaneous rho menyuam. Nws yog qhov ua rau muaj kev cuam tshuam ntawm cev xeeb tub thiab yog feem ntau paub tias ua rau muaj kev puas hlwb. https://en.wikipedia.org › wiki › Nondisjunction
Nondisjunction - Wikipedia
txhais tau hais tias ib khub ntawm homologous chromosomes tsis tau cais lossis cais ntawm anaphase kom ob leeg chromosomes ntawm khub dhau mus rau tib tus ntxhais cell. Qhov no feem ntau tshwm sim hauv meiosis, tab sis nws yuav tshwm sim hauv mitosis los tsim ib tus neeg mosaic.
Yuav ua li cas thaum homologous chromosomes tsis sib cais?
Aneuploidy yog tshwm sim los ntawm nondisjunction, uas tshwm sim thaum khub ntawm homologous chromosomes lossis tus muam chromatids tsis sib cais thaum lub sijhawm meiosis. Kev poob ntawm ib qho chromosome los ntawm diploid genome hu ua monosomy (2n-1), thaum qhov nce ntawm ib chromosome hu ua trisomy (2n + 1).
Thaum ib homologous chromosome tsis cais thaum lub sij hawm meiosis Qhov no hu ua?
Nondisjunction. Nondisjunction yog qhov ua tsis tiav ntawm homologous chromosomes (chromatids) kom sib cais kom zoo thaum lub sij hawm meiotic cell division.
Thaum chromosomes tsis cais nws hu ua?
Nondisjunction yog qhov ua tsis tiav ntawm chromosomes cais, uas tsim tau tus ntxhaiscov hlwb nrog cov lej txawv txav ntawm chromosomes. [
Pob homologous chromosomes cais?
In anaphase I, centromeres tawgthiab homologous chromosomes cais. Hauv telophase I, chromosomes txav mus rau cov ncej; Thaum lub sij hawm cytokinesis lub cell sib cais ua ob lub hlwb haploid.
