Qhov sib txawv tseem ceeb ntawm pachytene thiab diplotene yog tias pachytene yog theem thib peb ntawm prophase I thaum lub sij hawm hla dhau thiab DNA pauv ntawm nonsister chromatids tshwm sim thaum diplotene yog plaub theem ntawm prophase I thaum lub sij hawm synapsis xaus, thiab charismata. ua pom nyob rau hauv bivalents.
Meiosis yog ib qho ntawm ob hom kev faib cell. Nws tsim plaub lub hlwb uas muaj ib nrab ntawm cov khoom siv caj ces (n) muaj los ntawm niam txiv cell. Meiotic cell division tshwm sim thaum lub sij hawm kev sib deev kev sib deev los tsim gametes. Cov niam txiv ntawm tes faib ob zaug los tsim plaub tus ntxhais. Cov kev faib ob theem no hu ua meiosis I thiab meiosis II. Txhua qhov kev faib tawm yog rov muab faib ua ntu ntu ua prophase, metaphase, anaphase, thiab telophase. Prophase I yog qhov ntev tshaj plaws thiab tseem ceeb tshaj plaws ntawm meiosis I.
Thaum lub sijhawm prophase I, niam txiv thiab niam txiv homologous chromosomes ua ke nrog ib leeg, hla thiab sib pauv lawv cov khoom siv caj ces thiaj li tsim cov gametes sib txawv. Prophase I muaj tsib theem sub-theem npe raws li qhov pom ntawm chromosomes. Cov subphases no yog leptotene, zygotene, pachytene, diplotene, thiab diakinesis. Hauv pachytene, synapsis tiav thaum nyob rau hauv diplotene, chiasmata yog pov thawj.
Pachytene yog dab tsi?
Pachytene yog qhov thib peb theem ntawm prophase 1 ntawm meiosis 1. Thaum lub sij hawm pachytene, lub synaptonemal complex ua tiav, tso cai rau chiasma tsim. Tom qab ntawd txoj kev hla yuav siv sij hawm qhov chaw ntawm nonsister chromatids; qhov no ua rau bivalents.
Daim duab 01: Meiosis – Prophase I
Ntxiv mus, nyob rau hauv tag nrho zipped li tetrads, kev sib pauv ntawm cov tshuaj caj ces ntawm leej niam thiab leej txiv tshwm sim, qhia cov caj ces tshiab rau gametes. Yog li, theem no tseem ceeb heev vim nws yog lub luag haujlwm rau kev hloov pauv caj ces ntawm cov kab mob.
Diplotene yog dab tsi?
Diplotene yog plaub theem ntawm prophase I. Nws tshwm sim tom qab pachytene thiab ua raws li diakinesis. Thaum lub sij hawm diplotene, synapsis xaus, yog li synaptonemal complexes ploj. Chromosomes condense ntxiv.
Daim duab 02: Synaptonemal Complex
Chiasmata ua kom pom tag nrho nyob rau hauv bivalents nyob rau hauv lub microscope. Homologous chromosome khub pib tsiv mus nyob sib nrug tab sis tseem txuas nrog ntawm chiasmata.
Qhov Zoo sib xws ntawm Pachytene thiab Diplotene yog dab tsi?
- Pachytene thiab diplotene yog ob theem ntawm prophase I ntawm meiosis I.
- Ob theem yog lub luag haujlwm rau kev hloov pauv caj ces ntawm cov kab mob.
- Nyob rau hauv ob theem, homologous chromosomes tseem kaw rau ib leeg.
Qhov txawv ntawm Pachytene thiab Diplotene yog dab tsi?
Pachytene yog qhov thib peb theem ntawm prophase I thaum lub sijhawm hla thiab kev sib txuas ntawm caj ces tshwm sim. Diplotene yog qhov thib plaub theem ntawm prophase I thaum lub sij hawm homologous chromosomes pib sib nrug, chiasmata pom, thiab synaptonemal complex ploj. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm pachytene thiab diplotene. Tsis tas li ntawd, pachytene ua raws li diplotene thaum diplotene ua raws li diakinesis. Ntxiv mus, synapsis tiav los ntawm pachytene thaum synapsis xaus hauv diplotene. Yog li, qhov no yog lwm qhov sib txawv ntawm pachytene thiab diplotene.
Cov ntaub ntawv hauv qab no-daim duab qhia qhov sib txawv ntawm pachytene thiab diplotene hauv daim ntawv tabular.
Summary – Pachytene vs Diplotene
Pachytene thiab diplotene yog ob theem ntawm prophase I ntawm meiosis I. Thaum lub sij hawm pachytene, lub synaptonemal complex tiav, tso cai rau bivalents tsim. Yog li ntawd, hla dhau yuav siv qhov chaw ntawm nonsister chromatids, ua kom yooj yim rau kev sib txuas ntawm caj ces ntawm niam thiab txiv cov khoom siv caj ces. Pachytene ua raws li diplotene. Thaum lub sij hawm diplotene, homologous chromosomes pib sib nrug. Tab sis lawv tseem txuas nrog ntawm chiasmata. Yog li ntawd, cov synaptonemal complex dissociates, thiab chiasmata ua pom nyob rau theem no. Yog li, qhov no qhia txog qhov sib txawv ntawm pachytene thiab diplotene.
