Synapsis vs Hla Hla
Synapsis thiab hla dhau yog ob txoj kev sib cuam tshuam, uas yog qhov tseem ceeb rau kev hloov pauv chromosomal. Kev hloov pauv yog qhov hloov pauv ntawm nucleotide ib ntus ntawm genome ntawm cov kab mob. Lawv yog cov laj thawj tseem ceeb rau kev sib txawv ntawm cov xeeb ntxwv. Kev hloov pauv tuaj yeem tshwm sim los ntawm ib txwm muaj lossis artificially. Ib qho kev hloov pauv zoo tshaj plaws tshwm sim yog kev hla dhau. Ob leeg synapsis thiab hla tuaj yeem tshwm sim thaum lub sij hawm meiosis, uas txhais tau tias yog ib hom kev faib cellular uas tsim gametes thaum lub sij hawm kev sib deev.
Synapsis
Synapsis yog kev sib koom ua ke ntawm homologous chromosomes thaum lub sijhawm prophase I ntawm meiosis I. Cov qauv tsim ntawm chromosome vim yog synapsis hu ua 'tetrad' lossis 'bivalent'. Txhua bivalent (los yog homologous chromosome khub) muaj xws li ib tug niam txiv homologue, uas Ameslikas inherits los ntawm ib tug poj niam, thiab ib tug txiv neej homologue, uas Ameslikas tau txais los ntawm txiv neej. Lub luag haujlwm tseem ceeb ntawm synapsis yog tso cai rau homologous chromosomes mus rau txoj kev hla dhau, uas cov homologous chromosomes muaj peev xwm pauv cov khoom siv caj ces ntawm ib leeg. Tsis tas li ntawd, nws ua kom txhua tus ntxhais ntawm tes tau txais ib hom lus ntawm txhua tus niam txiv.
Hla Dhau
Hla-dhau yog txheej txheem los ntawm homologous chromosomes pauv lawv cov khoom siv caj ces thaum lawv raug synapsed. Thaum lub sijhawm txheej txheem no, qhov sib npaug ntawm chromatid los ntawm txhua homologue tawg tawm thiab rov qab mus rau qhov chaw sib txawv. Qhov no yog ib qho txheej txheem ntuj tsim, uas tsim cov kev sib txuas tshiab ntawm cov noob, yog li ua kom muaj kev sib txawv ntawm kev sib deev cov xeeb ntxwv. Kev hla dhau tuaj yeem tshwm sim ntawm txhua qhov chaw raws chromosome thiab tseem nyob ntawm ntau cov ntsiab lus sib txawv ntawm tib chromosome. Qhov no kuj pab ua kom muaj kev sib txawv ntawm cov xeeb ntxwv.
Dab tsi yog qhov txawv ntawm Synapsis thiab Hla Dhau?
• Synapsis yog kev sib koom ua ke ntawm homologous chromosome thaum lub sij hawm meiosis I, whereas crossing-over yog kev sib pauv ntawm genetic khoom ntawm homologues.
• Kev hla dhau ib txwm tshwm sim tom qab lub synapsis. Li no, cov txheej txheem ntawm synapsis yog qhov tseem ceeb rau kev hla dhau.
• Thaum lub sij hawm meiosis I, synapsis ib txwm tshwm sim, qhov kev hla dhau los yuav tsis tshwm sim.
• Synapsis yuav xyuas kom meej tias txhua tus ntxhais cell tau txais ib hom lus los ntawm txhua tus niam txiv thiab tso cai hla dhau.
• Tsis zoo li cov synapsis, kev hla dhau ua rau muaj kev hloov pauv zoo ntawm cov neeg sib deev.
• Tag nrho cov chromosome txav thaum lub sij hawm synapsis, qhov tsuas yog ib feem ntawm chromosome tau tsiv thaum lub sij hawm hla.
Nyeem ntxiv:
Qhov sib txawv ntawm kev sib txuas thiab hla dhau
