Qhov sib txawv tseem ceeb ntawm diplotene thiab diakinesis yog tias diplotene yog theem plaub ntawm prophase I ntawm meiosis I cell division, thaum diakinesis yog theem tsib ntawm prophase I ntawm meiosis kuv cell division.
Meiosis yog ib hom tshwj xeeb ntawm kev faib cell ntawm cov kab mob. Nws tshwm sim nyob rau hauv kev sib deev reproducing kab mob. Meiosis tshwm sim thaum tsim gametes xws li phev thiab qe qe. Lub tshuab ntawm meiosis tau piav qhia thawj zaug los ntawm German biologist Oscar Hertwig hauv xyoo 1876. Meiosis muaj ob theem tseem ceeb: meiosis I thiab meiosis II. Meiosis kuv tau muab faib ua 4 theem: prophase I, metaphase I, anaphase I, thiab telophase I. Muaj tsib theem hauv prophase I li leptotene, zygotene, pachytene, diplotene thiab diakinesis. Ntxiv mus, meiosis II muaj 4 theem: prophase II, metaphase II, anaphase II, thiab telophase II. Diplotene thiab diakinesis yog ob theem ntawm prophase I ntawm meiosis I cell division.
Diplotene (Diplonema) yog dab tsi?
Diplotene yog theem plaub ntawm prophase I ntawm meiosis I cell division. Cov theem no tseem hu ua diplonema. Diplonema yog ib lo lus Greek txhais tau tias "ob txoj xov." Hauv theem no, cov synaptonemal complex disassembles, thiab homologous chromosomes cais los ntawm ib leeg. Lub synaptonemal complex yog cov qauv protein uas tsim ntawm homologous chromosomes thaum lub sij hawm meiosis. Nws yog xav kom kho cov synapsis thiab homologous recombination thaum lub sij hawm theem ntawm leptotene, zygotene, pachytene ntawm prophase I ntawm meiosis kuv cell division hauv eukaryotes.
Daim duab 01: Diplotene
Txawm li cas los xij, homologous chromosomes ntawm txhua tus bivalent tseem nyob ruaj khov ntawm chiasmata nyob rau theem no. Chiasmata yog thaj chaw uas hla tau tshwm sim yav dhau los. Chiasmata tseem nyob rau ntawm cov chromosomes kom txog thaum lawv tau tawg ntawm kev hloov mus rau anaphase Kuv tso cai rau homologous chromosomes txav mus rau cov ncej ntawm tes.
Diakinesis yog dab tsi?
Diakinesis yog theem thib tsib ntawm prophase I ntawm meiosis I cell division. Diakinesis yog ib lo lus Greek uas txhais tau tias "mus dhau." Hauv theem no, chromosomes condense ntxiv. Feem ntau, nws yog thawj qhov chaw hauv meiosis qhov twg plaub feem ntawm tetrads pom tau tiag tiag. Cov chaw ntawm kev hla dhau kuj entangle ua ke los ntawm kev sib tshooj zoo. Qhov no ua rau chiasmata pom meej.
Daim duab 02: Diakinesis
Ntxiv rau qhov kev soj ntsuam saum toj no, qhov seem ntawm cov theem diakinesis zoo ib yam li prometaphase ntawm mitosis. Nyob rau theem no, nucleoli ploj, thiab cov ntaub so ntswg nuclear tawg mus rau hauv vesicles. Tsis tas li ntawd, lub meiotic spindle kuj pib tsim nyob rau hauv theem diakinesis. Mitotic spindle yog hais txog cov qauv cytoskeletal ntawm cov hlwb eukaryotic uas tsim thaum lub sijhawm cell faib txhawm rau cais cov chromatids ntawm cov menyuam ntxhais. Hauv mitosis, nws yog hu ua mitotic spindle, thaum nyob rau hauv meiosis, nws yog hu ua meiotic spindle.
Dab tsi yog qhov zoo sib xws ntawm Diplotene thiab Diakinesis?
- Diplotene thiab diakinesis yog ob theem ntawm prophase I.
- Ob theem pib muaj nyob rau hauv meiotic I cell division.
- Cov theem no tsuas yog muaj nyob rau hauv cov kab mob sib deev thaum tsim gametes xws li phev thiab qe qe.
- Lub chiasmata pom meej hauv ob theem.
Qhov txawv ntawm Diplotene thiab Diakinesis yog dab tsi?
Diplotene yog theem plaub ntawm prophase I ntawm meiosis I cell division, thaum diakinesis yog theem thib tsib ntawm prophase I ntawm meiosis I cell division. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm diplotene thiab diakinesis. Tsis tas li ntawd, nyob rau hauv lub diplotene theem, cov ntaub so ntswg nuclear tsis tawg mus rau hauv cov hlab ntsha, tab sis nyob rau hauv lub diakinesis theem, cov ntaub so ntswg nuclear disintegrates rau hauv vesicles.
Cov hauv qab no infographic nthuav tawm qhov sib txawv ntawm diplotene thiab diakinesis hauv daim ntawv teev npe rau ib sab ntawm kev sib piv.
Summary – Diplotene vs Diakinesis
Diplotene thiab diakinesis yog ob theem ntawm prophase I ntawm meiosis I cell division. Diplotene yog theem plaub ntawm prophase I ntawm meiosis I cell division, thaum diakinesis yog theem thib tsib ntawm prophase I ntawm meiosis I cell division. Yog li, qhov no qhia txog qhov sib txawv ntawm diplotene thiab diakinesis.
