Kev tsim. Kev tsim ntawm bivalent tshwm sim thaum thawj zaug ntawm meiosis (nyob rau theem pachynema ntawm meiotic prophase 1). Hauv cov kab mob feem ntau, txhua tus chromosome replicated (ua los ntawm ob tug viv ncaus chromatids zoo tib yam) elicits tsim DNA ob-strand so thaum lub sij hawm leptotene theem.
nyob rau theem twg ntawm meiosis yog bivalents tsim?
Nyob rau hauv 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 genetic recombination yuav tshwm sim.
tetrad yog dab tsi thiab thaum twg nws tsim?
Tus tetrad tshwm sim thaum thawj theem ntawm meiosis. Nws yog plaub ntawm chromatids uas cov ntaub ntawv thaum rov ua homologous chromosomes align. Nws yuav tsum tau tsim kom hla dhau los tshwm sim. Nws tawg sib nrug thaum cov homologous chromosomes cais hauv meiosis I.
tetrad daim ntawv theem twg?
In prophase I ntawm meiosis, homologous chromosomes 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.
Dab tsi yog bivalents hauv meiosis?
Thaum lub sijhawm prophase ntawm meiosis kuv, homologous chromosomes khub thiab tsim synapses. Cov chromosomes ua ke yog hu ua bivalents. Cov bivalent muaj ob chromosomes thiab plaub chromatids, nrog ib chromosome los ntawm txhua tus niam txiv.
