Homologous chromosomes tsis ua haujlwm zoo ib yam hauv mitosis li lawv ua hauv meiosis. Ua ntej txhua tus mitotic faib ib lub xovtooj mus, cov chromosomes hauv niam txiv cell rov ua dua lawv tus kheej. Lub homologous chromosomes nyob rau hauv lub cell yuav ib txwm tsis ua khubthiab tau txais genetic recombination nrog ib leeg.
Yuav ua li cas rau homologous chromosomes thaum lub sij hawm meiosis?
Thaum recombination tshwm sim thaum lub sij hawm meiosis, lub cell lub homologous chromosomes kab nyob ze heev rau ib leeg. Tom qab ntawd, DNA strand nyob rau hauv txhua chromosome so nyob rau hauv tib qhov chaw, tawm hauv ob lub dawb xaus. Txhua qhov kawg ces hla mus rau lwm qhov chromosome thiab tsim kev sib txuas hu ua chiasma.
theem twg ntawm meiosis ua homologous chromosomes 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 sib dhos ntawm nruab nrab ntawm tes. Tom qab cov khub ntawm chromosomes raug sib raug zoo, anaphase kuv pib.
Vim li cas homologous chromosomes khub?
Homologs muaj tib cov noob hauv tib qhov chaw qhov chaw lawv muab cov ntsiab lus raws txhua tus chromosome uas ua rau ob peb chromosomes ua kom raug rau ib leeg ua ntej sib cais thaum lub sijhawm meiosis.
Thaum ob homologous chromosomes kabthaum meiosis no hu ua?
Cov xwm txheej ntawm metaphase II zoo ib yam li cov mitotic metaphase - hauv ob qho tib si, cov chromosomes kab raws li lub cell's equatorial phaj, kuj hu ua metaphase phaj, hauv kev npaj. rau lawv qhov kev sib cais (Daim duab 5).
