Yuav ua li cas yog lub npe rau qhov chaw ntawm kev hla nyob rau hauv ib tug chromosome?
Yuav ua li cas yog lub npe rau qhov chaw ntawm kev hla nyob rau hauv ib tug chromosome?

Video: Yuav ua li cas yog lub npe rau qhov chaw ntawm kev hla nyob rau hauv ib tug chromosome?

Video: Yuav ua li cas yog lub npe rau qhov chaw ntawm kev hla nyob rau hauv ib tug chromosome?
Video: Yuav tawm ntawm txoj kev txom nyem tau li cas? 2024, Kaum ib hlis
Anonim

Hla mus tshwm sim ntawm prophase I thiab metaphase I thiab yog txheej txheem uas ob homologous chromosome non-viv ncaus chromatids ua ke nrog ib leeg thiab sib pauv sib txawv ntawm cov khoom siv caj ces los ua ob lub recombinant chromosome tus muam chromatids.

Tib neeg kuj nug, kev hla kuj hu ua dab tsi?

Hla mus yog ib lub tswv yim tseem ceeb ntawm noob caj noob ces thiab cell biology, feem ntau hu ua recombination. Nws tshwm sim thaum meiosis. Hla mus yog kev sib pauv ntawm chromosome ntu ntawm non-viv ncaus chromatids thaum lub sij hawm tsim gametes.

Kuj Paub, nws hu ua dab tsi thaum chromosomes pauv qhov zoo? Chromosomal crossover. Homologous recombination yog txheej txheem uas ob chromosomes , ua ke thaum lub sij hawm prophase 1 ntawm meiosis, pauv qee qhov distal ntawm lawv DNA. Yog hais tias lawv tawg ntawm tib qhov chaw los yog qhov chaw nyob rau hauv ib theem zuj zus ntawm lub hauv paus khub, qhov tshwm sim yog ib qho pauv ntawm cov noob caj noob ces, hu ua genetic recombination.

Txog qhov no, puas tuaj yeem hla dhau ntawm cov chromosomes nonhomologous?

Nws ua tau heev. Qhov no yog hu ua translocation. Thaum twg nonhomologous chromosomes yog matched los ntawm kev huam yuaj, cov chromosomes ntoo khaub lig dhau nyob rau hauv ib tug nonsymmetrical zam.

Kev ywj pheej assortment txhais li cas?

Txhais ntawm ywj siab assortment .: kev tsim ntawm kev sib txuas ntawm chromosomes hauv meiosis thiab cov noob ntawm cov khub sib txawv ntawm homologous chromosomes los ntawm txoj cai raws li txoj cai ntawm qhov tshwm sim ntawm ib qho ntawm txhua tus diploid khub ntawm homologous chromosomes rau hauv txhua gamete ywj siab ntawm ib leeg khub.

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