Qhov sib txawv tseem ceeb ntawm leptotene thiab zygotene yog tias leptotene yog thawj theem ntawm prophase I thaum lub sij hawm uas nuclear chromatin condenses los tsim ntev nyias strands ntawm tus neeg chromosomes thaum zygotene yog qhov thib ob substage ntawm prophase I thaum lub sij hawm uas chromosomes paub thiab ua raws. nrog ib leeg ua homologous chromosome khub nyob rau hauv thiaj li yuav tsim synaptonemal complexes.
Prophase Kuv yog lub sijhawm ntev tshaj plaws thiab tseem ceeb hauv meiosis. Homologous chromosomes tsim tetrads, thiab hla dhau los ntawm qhov tsis yog tus muam chromatids. Cov khoom siv caj ces yog pauv ntawm niam thiab txiv chromosomes. Nws ua rau kev tsim ntawm cov caj ces sib txawv gametes. Yog li, meiosis yog qhov tshwm sim tseem ceeb uas tsim cov kab mob sib txawv. Muaj tsib theem hauv prophase I. Lawv yog leptotene, zygotene, pachytene, diplotene thiab diakinesis. Leptotene yog thawj theem, thiab nws ua raws li zygotene. Thaum lub sij hawm leptotene, replicated chromosomes condense, thiab ib tug neeg chromosomes pom raws li xov zoo li cov qauv. Thaum lub sij hawm zygotene, homologous chromosomes kab nrog ib leeg, thiab synapsis tshwm sim.
Leptotene yog dab tsi?
Leptotene yog thawj theem ntawm prophase I. Thaum lub sij hawm leptotene, cov chromatins nuclear pib condense thiab tsim ib hom kab mob tshwj xeeb ntawm chromosomes. Ntxiv mus, txhua tus chromosome duplicates thiab ob tug muam chromatids ua qhov txawv.
Daim duab 01: Synaptonemal Complex ntawm Ntau theem thaum Prophase I
Tus neeg chromosomes tshwm sim ib leeg, ntev xov zoo li cov qauv. Tsis tas li ntawd, centriole yog duplicated, thiab tus ntxhais centrioles tsiv mus rau ob tug opposite ncej ntawm lub cell.
Zygotene yog dab tsi?
Zygotene yog lub thib ob subphase ntawm prophase 1 ntawm meiosis 1. Thaum lub sij hawm no theem, niam thiab txiv homologous chromosomes sib ntsib, kab thiab ua homologous chromosome khub. Tom qab ntawd cov khub niam txiv sib koom ua ke los ntawm kev tsim cov synaptonemal complex hu ua bivalents lossis tetrads.
Daim duab 02: Homologous Chromosome Pair
Thaum lub sijhawm synapsis, cov cheeb tsam sib txuas ntawm cov ntaub ntawv caj ces ntawm txhua homologous chromosome ua ke nrog ib leeg, tso cai rau kev sib txuas ntawm caj ces tshwm sim nyob rau theem tom ntej, uas yog pachytene.
Dab tsi zoo sib xws ntawm Leptotene thiab Zygotene?
- Leptotene thiab zygotene yog ob theem ntawm prophase I ntawm meiosis I.
- Ob theem yog rau qhov ntev tshaj plaws thiab nyuaj tshaj plaws ntawm meiosis.
- Chromosomes tshwm raws li xov zoo li cov qauv hauv ob theem.
- Ob theem tshwm sim hauv lub nucleus.
- Txheej xwm tshwm sim nyob rau hauv ob theem tseem ceeb heev rau kev tsim cov noob caj noob ces gametes.
- Thaum kawg, ob theem ua rau muaj kev hloov pauv caj ces ntawm cov kab mob.
Qhov txawv ntawm Leptotene thiab Zygotene yog dab tsi?
Thaum lub sijhawm leptotene, chromatin tau teem rau hauv cov hlua ntev thiab nyias. Thaum lub sij hawm zygotene, homologous chromosomes ua ke nrog ib leeg, thiab synapsis yuav siv sij hawm los pab txhawb homologous recombination. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm leptotene thiab zygotene. Ntxiv mus, leptotene yog thawj theem ntawm prophase I, thiab nws ua raws li zygotene. Zygotene yog theem thib ob ntawm prophase I, thiab nws ua raws li pachytene. Yog li, qhov no yog lwm qhov sib txawv ntawm leptotene thiab zygotene.
Hauv qab infographic teev ntau qhov sib txawv ntawm leptotene thiab zygotene hauv daim ntawv tabular.
Summary – Leptotene vs Zygotene
Leptotene yog thawj theem ntawm prophase I. Thaum lub sij hawm leptotene, chromosomes pib condense, thiab ob tug muam chromatids pom. Zygotene yog theem thib ob ntawm prophase I. Thaum lub sij hawm zygotene, chromosomes paub ib leeg, ua raws li homologous chromosome khub, thiab synapsis tshwm sim. Yog li, qhov no qhia txog qhov sib txawv ntawm leptotene thiab zygotene. Ob theem pab ua kom muaj kab mob sib txawv.
