Qhov sib txawv tseem ceeb ntawm pachytene thiab zygotene yog tias pachytene yog theem thib peb ntawm prophase 1 uas homologous recombination lossis chromosomal crossover tshwm sim ntawm cov tsis yog tus muam chromatids. Lub caij no, zygotene yog theem thib ob ntawm prophase 1 uas niam thiab txiv chromosomes sib txuas ua ke rau hauv homologous chromosome khub.
Meiosis yog ib qho ntawm ob hom kev faib cell. Meiosis tshwm sim thaum muaj kev sib deev hauv kev sib deev los tsim cov hlwb los yog gametes. Muaj ob txoj kev faib cell ua tiav hauv meiosis li meiosis 1 thiab meiosis 2. Meiosis 1 thiab meiosis 2 tau muab faib ua ntau theem xws li prophase, metaphase, anaphase, thiab telophase. Prophase 1 ntawm meiosis 1 yog lub sijhawm ntev tshaj plaws ntawm meiotic cell division. Nws yog theem uas yog lub luag haujlwm rau kev hloov pauv caj ces vim hla dhau ntawm homologous chromosomes thiab recombination. Ntxiv mus, muaj tsib theem ntawm prophase 1: leptotene, zygotene, pachytene, diplotene, thiab diakinesis.
Pachytene yog dab tsi?
Pachytene yog qhov thib peb sub-theem ntawm prophase 1 ntawm meiosis 1. Thaum lub sij hawm pachytene, hla dhau yuav siv qhov chaw ntawm bivalents tsim nyob rau hauv lub kawg ntawm lub zygotene. Txoj kev hla ntawm cov tsis yog tus muam chromatids ua rau muaj kev sib txuas ntawm caj ces ntawm niam thiab txiv cov khoom siv caj ces. Cov theem no yog qhov tseem ceeb thiab tseem ceeb heev vim nws yog lub luag haujlwm rau kev hloov pauv caj ces ntawm cov kab mob.
Daim duab 01: Chromosomal Hla
Zygotene yog dab tsi?
Zygotene yog theem thib ob ntawm prophase 1 ntawm meiosis 1. Thaum lub sijhawm no, niam txiv thiab leej txiv chromosomes sib ntsib thiab ua ib khub. Tom qab ntawd, khub niam txiv sib koom ua ke los ntawm kev tsim cov synaptonemal complex hu ua bivalents lossis tetrads.
Daim duab 02: Pairing of Homologous Chromosomes
Thaum lub sijhawm synapsis, cov cheeb tsam sib thooj ntawm cov ntaub ntawv caj ces ntawm txhua homologous chromosome ua ke nrog ib leeg.
Dab tsi zoo sib xws ntawm Pachytene thiab Zygotene?
- Pachytene thiab zygotene yog ob theem ntawm prophase 1 ntawm meiosis.
- Ob theem muaj rau meiosis 1.
- Cov theem no tshwm sim thaum lub sijhawm ntev tshaj plaws ntawm meiosis.
- Ob theem yog lub luag haujlwm rau kev sib xyaw ntawm cov khoom siv caj ces ntawm homologous chromosomes.
- Vim li ntawd, kev hloov pauv caj ces ntawm cov kab mob tshwm sim.
Qhov txawv ntawm Pachytene thiab Zygotene yog dab tsi?
Pachytene yog theem uas pauv cov khoom siv caj ces lossis kev hla dhau los ntawm cov tsis yog tus muam chromatids ntawm bivalents. Zygotene, ntawm qhov tod tes, yog theem ntawm kev sib koom ua ke ntawm homologous chromosomes siv qhov chaw tsim cov synaptonemal complexes. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm pachytene thiab zygotene.
Ntxiv mus, pachytene yog theem thib peb, thaum zygotene yog theem thib ob ntawm prophase 1. Tsis tas li ntawd, lwm qhov sib txawv ntawm pachytene thiab zygotene yog pachytene ua raws li diplotene, thaum zygotene ua raws li pachytene.
Hauv qab infographic tabulates ntau qhov sib piv ntawm qhov sib txawv ntawm pachytene thiab zygotene.
Summary – Pachytene vs Zygotene
Pachytene thiab zygotene yog ob theem ntawm prophase 1 hauv meiotic cell division. Zygotene yog theem thib ob, thiab thaum lub sijhawm no, cov chromosomes homologous ntawm niam thiab txiv tuaj los ze zog thiab ua ib khub. Tom qab ntawd, lawv tsim synaptonemal complexes. Zygotene ua raws li pachytene, uas yog thib peb sub-theem. Thaum lub sij hawm pachytene, hla ntawm cov uas tsis yog-viv ncaus chromatids tshwm sim, ua rau muaj kev sib pauv ntawm cov khoom siv caj ces ntawm lawv. Yog li, qhov no ua rau muaj kev hloov pauv caj ces ntawm cov kab mob. Yog li, hauv cov ntsiab lus, qhov no yog qhov txawv ntawm pachytene thiab zygotene.
