Nyob hauv pachytene, cov chromosomes bivalent pom meej meej raws li tetrad. Thaum cov chromosomes tau tsim nyob rau hauv lub zygotene theem ntawm prophase- kuv los ntawm cov txheej txheem ntawm kev koom tes ntawm synaptonemal complexes hu ua synapsis. Yog li, cov lus teb raug yog 'Pachytene'.
Puas muaj pes tsawg chromatids muaj bivalent ntawm pachytene?
Ib tug meiotic bivalent kuj muaj plaub chromatids, uas, txawm li cas los xij, tuav lub koom haum nruj hauv khub tom qab pachytene. Ntawm no cov coiling kev sib raug zoo yog complex. Cov khub niam txiv chromatids tej zaum spiralize ua ke.
Lub sijhawm twg ntawm meiosis cov bivalents sib nrug?
Thaum lub sijhawm metaphase I, cov ntaub ntawv spindle apparatus thiab cov chromosomes ua ke ua ke raws tus ncej equatorial ntawm tes. Thaum lub sij hawm anaphase I, tus neeg bivalents cais tawm ntawm ib leeg; Tom qab ntawd homologous chromosomes, nrog lawv cov cognate centromere, raug sib cais thiab kos rau cov ncej ntawm tes.
txheej txheem pib li cas hauv theem pachytene?
Pachytene. Qhov thib peb theem ntawm prophase I, pachytene (los ntawm Greek rau "thick"), pib ntawm ua tiav ntawm synapsis Chromatin tau condensed txaus tias chromosomes tam sim no tuaj yeem daws tau hauv microscopy. Cov qauv hu ua recombination nodules tsim ntawm synaptonemal complex ntawm bivalents.
Yuav ua li cas yog bivalent condition of prophase?
Thaum meiosis-I, nyob rau hauv zygotene theem ntawm prophase-I, lub bivalent chromosomes kom meej meej tshwm sim li tetrads. Ntawm no, homologous chromosomes ua ke ua ke los tsim tetrads. Cov tetrads no tseem hu ua bivalents thiab lawv tau txais kev sib koom ua ke hauv theem pachytene.
