Dab tsi ua rau kev hla dhau?
Dab tsi ua rau kev hla dhau?

Video: Dab tsi ua rau kev hla dhau?

Video: Dab tsi ua rau kev hla dhau?
Video: Sib Hawm Dhau (Time Passed) Music Video by: Deeda/Dib Xwb 2024, Kaum ib hlis
Anonim

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Hla mus yog kev sib pauv ntawm cov khoom siv caj ces uas tshwm sim hauv kab kab mob. Thaum lub sij hawm tsim cov qe thiab cov phev hlwb, tseem hu ua meiosis, ua ke chromosomes los ntawm txhua tus niam txiv sib haum kom zoo sib xws DNA sib lawv liag los ntawm pairedchromosomes. hla dhau ib leeg

Ib yam li ntawd, dab tsi yog hla dhau thiab thaum twg nws tshwm sim hauv meiosis?

Hla mus (genetic recombination) yog qhov txheej txheem uas homologous chromosomes ua ke nrog ib leeg thiab sib pauv sib txawv ntawm cov khoom siv caj ces los ua cov recombinantchromosomes. Nws tshwm sim ntawm prophase 1 thiab metaphase 1 ntawm meiosis.

Tsis tas li ntawd, kev hla dhau yog dab tsi thiab vim li cas nws tseem ceeb? Hla mus , los yog recombination, yog kev sib pauv ntawm chromosome ntu ntawm nonsister chromatids hauv meiosis. Hla mus tsim kev sib txuas tshiab ntawm cov noob hauv thegametes uas tsis pom nyob rau hauv niam txiv, pab txhawb kev sib txawv ntawm cov noob caj noob ces.

Xav txog qhov no, dab tsi ua rau hla hauv meiosis?

Hla mus Nws yog ib qho tseem ceeb rau kev sib cais ntawm cov chromosomes thaum lub sij hawm meiosis . Hla kev kuj suav nrog kev hloov pauv caj ces, vim yog kev hloov pauv ntawm cov khoom siv caj ces thaum lub sijhawm hla dhau , thechromatids tuav ua ke los ntawm centromere tsis zoo ib yam.

Qhov chaw hla dhau yog dab tsi?

Duplicated homologous chromosomes khub, thiab hla - dhau (kev sib pauv lub cev ntawm chromosomeparts) tshwm sim. Hla - dhau yog tus txheej txheem uas cangive nce mus rau genetic recombination. Cov qhov chaw hla - dhau pom tias yog crisscrossed nonsisterchromatids thiab hu ua chiasmata (singular: chiasma).

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