Lub chiasmata tau pom thaum the diplotene theem ntawm prophase Intawm meiosis, tab sis qhov tseeb "hloov-overs" ntawm cov khoom siv caj ces tau xav tias yuav tshwm sim thaum lub sijhawm pachytene dhau los.
Chiasmata nyob qhov twg?
Chiasmata yog cov qauv tshwj xeeb chromatin uas txuas homologous chromosomes ua ke kom txog thaum anaphase I (Fig. 45.1 thiab 45.10). Lawv tsim ntawm qhov chaw uas programmed DNA tawg tsim los ntawm Spo11 tau dhau los ua txoj hauv kev rov ua dua tshiab los tsim kev sib tw.
Tam sim no ntawm Terminalisation puas chiasmata tshwm sim?
The chiasma theem tshwm sim thaum the diplotene theem ntawm Prophase I. Nws yog theem plaub tom qab leptotene, zygotene, thiab pachytene. Yog li, cov lus teb raug yog kev xaiv C. Lus Cim: Kev tsim chiasma ua rau kev hloov pauv ntawm cov khoom siv caj ces ntawm ob ntu ntawm cov tsis yog tus muam chromatids uas ua rau muaj kev hloov pauv.
Chiasmata hauv meiosis yog dab tsi?
Abstract. Lub chiasma yog tus qauv uas tsim ntawm ib khub ntawm homologous chromosomes los ntawm crossover recombination thiab lub cev txuas cov homologous chromosomes thaum lub sij hawm meiosis.
nyob rau theem twg ntawm prophase 1 ntawm meiosis 1 peb tuaj yeem pom chiasmata tsim?
Diakinesis . Diakinesis yog theem kawg ntawm Prophase 1 thiab yog qhov kev txiav tawm ntawm cov condensing ntawm chromosomes, qhov no tso cai rau chiasmata thiabCov qauv bivalent kom pom meej dua nyob rau hauv lub tshuab hluav taws xob electron. Cov chromosomes nyob ntawm lawv daim ntawv condensed tshaj plaws thaum lub sij hawm diakinesis.
