Nyob rau hauv pachynema, cov chromosomes homologous ua kom zoo sib xws. Cov txheej txheem no hu ua synapsis. (Cov chromosomes tau hais tias muaj synapsed.) Cov synapsed homologous khub ntawm chromosomes hu ua tetrad, vim nws muaj plaub chromatids.
Yuav ua li cas hauv zygotene theem?
Thaum zygotene, homologous chromosomes pib ua raws lawv tag nrho ntev los ntawm txheej txheem hu ua synapsis uas yog qhov tseeb. Txhua khub ntawm chromosomes yog tuav ua ke los ntawm ib tug ribbon zoo li cov protein thiab tsim cov synaptonemal complex. Tom qab ntawd, thaum lub sij hawm pachytene, khub ntawm chromosomes ua condensed thiab coiled.
Yuav ua li cas thaum Diplotene?
Nyob rau hauv lub diplotene theem synaptonemal complexes loosen thiab ib nrab sib cais ntawm txhua khub niam txiv chromatids los ntawm lawv homologous counterparts tshwm sim. Cov chromatids tseem nyob ua ke ntawm cov centromeres thiab cov chaw hla dhau. Lub sijhawm dictyotene yog lub sijhawm so ntawm oocyte.
Yuav ua li cas yog cov kauj ruam ntawm prophase?
Prophase kuv muab faib ua tsib theem: leptotene, zygotene, pachytene, diplotene, thiab diakinesis.
YYuav ua li cas hauv pachytene ntawm meiosis?
Ntawm pachytene lawv khub, qhov sib thooj ntawm ob chromosomes dag ib sab. Chromosomes ces duplicate thiab cog lus rau ua khub chromatids. Nyob rau theem no, khub ntawm chromosomes hu ua tetrad, raws li nws muajplaub chromatids.
