Thaum lub sijhawm meiosis I, homologous chromosomes ntawm txhua khub tuaj ua ke thiab ua ib sab ntawm ib sab hauv qhov xwm txheej hu ua synapsis. Synapsis tshwm sim hauv tetrad, ib qho kev koom ua ke ntawm plaub chromatids(ob homologous chromosomes uas muaj ob chromatids txhua).
Thaum nyob rau hauv meiosis kuv ua homologous chromosomes los ua ib tug tetrad?
In prophase I ntawm meiosis, cov chromosomes homologous tsim cov tetrads. Hauv metaphase I, cov khub no nyob rau ntawm qhov chaw nruab nrab ntawm ob tus ncej ntawm tes los tsim cov phaj metaphase.
tetrad hauv meiosis 1 yog dab tsi?
In meiosis. Txhua khub ntawm chromosomes-hu ua tetrad, los yog bivalent- muaj plaub chromatids. Lub sijhawm no, homologous chromosomes pauv cov khoom siv caj ces los ntawm cov txheej txheem hla (saib pawg sib txuas).
Dab tsi tshwm sim li homologous chromosomes khub thaum lub sijhawm prophase 1 ntawm meiosis?
Lub sijhawm prophase I, homologous chromosomes khub thiab tsim synapses, ib kauj ruam tshwj xeeb rau meiosis. Cov chromosomes ua ke yog hu ua bivalents, thiab tsim ntawm chiasmata tshwm sim los ntawm caj ces recombination ua pom tseeb. Chromosomal condensation tso cai rau cov no los saib hauv lub tshuab tsom.
Yuav ua li cas rau homologous chromosomes thaum lub sij hawm meiosis?
Thaum recombination tshwm sim thaum lub sij hawm meiosis, cell's homologous chromosomes kab ntau heev.nyob ze 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.
