Nyob rau theem twg ua homologous chromosomes kab ntawm kab zauv?
Nyob rau theem twg ua homologous chromosomes kab ntawm kab zauv?

Video: Nyob rau theem twg ua homologous chromosomes kab ntawm kab zauv?

Video: Nyob rau theem twg ua homologous chromosomes kab ntawm kab zauv?
Video: Rau rau siab rau koj lub me neej cover maiv thoj 2023 2024, Kaum ib hlis
Anonim

Hauv metaphase Kuv, 23 khub ntawm homologous chromosomes kab raws tus kab zauv los yog metaphase phaj ntawm lub cell. Thaum lub sij hawm mitosis, 46 tus neeg chromosomes line up metaphase Txawm li cas los xij, thaum lub sij hawm meiosis kuv, 23 homologous khub ntawm chromosomes kab.

Tib neeg kuj nug, thaum lub sij hawm dab tsi ntawm meiosis ua homologous chromosomes kab ntawm txoj kab nruab nrab?

Metaphase

Qhov thib ob, puas homologous chromosomes kab hauv mitosis? Homologous chromosomes muaj nyob rau hauv ob qho tib si mob mitosis thiab meiosis , tab sis lawv tsis tsim khub hauv mob mitosis . Es lawv yuav tsim homologous chromosome khub thaum meiosis , uas tso cai rau kev hla mus tshwm sim.

Tsis tas li lo lus nug yog, dab tsi theem ua chromosomes kab raws kab zauv tsis nyob rau hauv homologous khub?

Metaphase I : Lub sijhawm metaphase I , spindle apparatus tsim los ntawm opposite xaus ntawm lub cell. Lub spindle apparatus ces xa tawm spindle fibers mus txuas rau chromosomes. Txawm li cas los xij, txij li cov chromosomes homologous yog lined ntawm ib sab rau kev hla dhau, lawv tau tuav nruj ua ke.

Lub hom phiaj ntawm meiosis yog dab tsi?

Meiosis, ntawm qhov tod tes, yog siv rau ib lub hom phiaj hauv tib neeg lub cev: kev tsim cov gametes-sex hlwb, lossis phev thiab qe . Nws lub hom phiaj yog ua kom cov menyuam ntxhais nrog ib nrab ntawm ntau chromosomes raws li lub cell pib.

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