Cov lus teb raug: Cov chromosomes homologous muaj ob chromosomes thiab plaub chromatids nyob rau theem prophase.
Yuav ua li cas rau chromosomes thaum lub sij hawm prophase?
Thaum lub sijhawm prophase, qhov nyuaj ntawm DNA thiab cov proteins uas muaj nyob hauv cov nucleus, hu ua chromatin, condenses. Cov chromatin coils thiab dhau los ua compact, ua rau tsim cov chromosomes pom. … Cov chromosomes replicated muaj X zoo thiab hu ua muam chromatids.
Lub sijhawm twg ntawm meiosis yuav cov chromosomes homologous khub?
Thaum prophase I, homologous chromosomes khub thiab sib pauv ntu ntawm DNA. Qhov no yog hu ua recombination los yog hla dhau. Qhov no yog ua raws li metaphase I qhov twg cov khub sib txuas ntawm chromosomes nyob nruab nrab ntawm lub cell.
Qhov xwm txheej twg tshwm sim ua ntej pib mitosis?
Prophase. Mitosis pib nrog prophase, thaum lub sijhawm chromosomes nrhiav condensin thiab pib ua cov txheej txheem condensation uas yuav txuas ntxiv mus txog thaum metaphase. Hauv ntau hom, cohesin feem ntau raug tshem tawm ntawm caj npab ntawm tus muam chromatids thaum lub sij hawm prophase, tso cai rau tus viv ncaus chromatids daws tau.
Cov xwm txheej twg tsis tshwm sim ua ntej pib mitosis?
Qhov xwm txheej twg tsis tshwm sim ua ntej pib mitosis? Lub nuclearhnab ntawv disintegrates. DNA yog replicated.
