Qhov sib txawv tseem ceeb ntawm anaphase I thiab anaphase II yog tias thaum lub sij hawm anaphase I, homologous chromosomes tau sib cais thiab raug rub mus rau cov ncej sab nraud thaum lub sij hawm anaphase II, tus muam chromatids tau sib cais thiab raug rub mus rau ntawm tus ncej ntawm tus ncej. lub cell.
Mitosis thiab meiosis yog ob hom kev faib tawm nuclear uas tshwm sim hauv lub cell. Raws li qhov tshwm sim ntawm mitosis, lub nucleus faib ua ob lub hlwb, thiab txhua tus muaj tib tus lej chromosomal raws li niam txiv nuclei. Txawm li cas los xij, nyob rau hauv meiosis, tus naj npawb ntawm cov chromosomes nuclear uas cov ntxhais cell muaj yog halved los ntawm niam txiv nuclei. Meiosis tshwm sim thaum lub sij hawm tsim ntawm kev sib deev hlwb xws li phev thiab qe nyob rau hauv thiaj li yuav nqa tawm kev sib deev kev sib deev. Li no, raws li qhov tshwm sim ntawm meiosis, ib lub xov tooj ntawm niam txiv tsim plaub tus ntxhais lub hlwb uas muaj ib nrab ntawm cov chromosomes ntawm niam txiv cell.
Tsis tas li ntawd, genetic recombination tshwm sim thaum lub sij hawm meiosis. Yog li ntawd, qhov tshwm sim gametes yog qhov sib txawv ntawm caj ces, thiab cov xeeb ntxwv uas tshwm sim kuj yog qhov sib txawv. Meiosis suav nrog ob qhov kev faib ua tiav nuclear; i.e. meiosis I thiab meiosis II. Ob leeg meiosis I thiab meiosis II muaj plaub theem, piv txwv li prophase, metaphase, anaphase, thiab telophase.
Anaphase kuv yog dab tsi?
Anaphase I yog ib theem ntawm meiosis I. Nws pib tom qab metaphase I. Thaum lub sij hawm metaphase I, ob homologous chromosome khub npaj nyob rau hauv txoj kab nruab nrab ntawm lub cell, thiab lawv cov centromeres txuas nrog spindle fibers los ntawm txhua tus. ncej ntawm cell. Thaum qhov kev npaj chromosome no dhau lawm, qhov anaphase kuv pib.
Daim duab 01: Anaphase I
Thaum pib ntawm anaphase I, lub xov tooj ntawm tes pib ntev. Raws li qhov tshwm sim ntawm qhov ntev ntawm lub xovtooj, spindle fiber stretch mus rau opposite ncej, cais cov homologous chromosomes rau hauv haploid poob lawm. Li no, qhov no yog qhov xwm txheej tseem ceeb uas tshwm sim thaum lub sij hawm anaphase I. Tom qab anaphase kuv, telophase kuv pib.
Anaphase II yog dab tsi?
Anaphase II tshwm sim ntawm meiosis II, uas zoo ib yam li anaphase ntawm mitosis. Anaphase II ua raws li metaphase II. Thaum kawg ntawm metaphase II, cov chromosomes haploid tau teem ib ncig ntawm txoj kab nruab nrab ntawm qhov ntxaiv. Ob lub spindles (ib qho ntawm txhua tus ncej) txuas nrog lub centromere ntawm ib chromosome.
Daim duab 02: Anaphase II
Thaum anaphase kuv pib, spindle fibers rub haploid chromosomes ntawm lawv cov ncej. Vim yog lub zog no, centromere splits thiab tus muam chromatids sib cais los ntawm ib sab ntawm txoj kab nruab nrab. Spindle fibers rub tus muam chromatids ntawm lawv cov ncej. Yog li, qhov no yog qhov xwm txheej tseem ceeb uas tshwm sim thaum lub sij hawm anaphase II.
Dab tsi zoo sib xws ntawm Anaphase I thiab Anaphase II?
- Anaphase I thiab anaphase II yog ob theem ntawm meiosis.
- Lub sijhawm no, cov spindle fibers rub chromosomes ntawm lawv cov ncej.
- Tsis tas li, spindle fibers ua luv luv hauv ob theem.
Qhov txawv ntawm Anaphase I thiab Anaphase II yog dab tsi?
Qhov sib txawv tseem ceeb ntawm anaphase I thiab anaphase II yog thaum lub sij hawm anaphase I, ua tiav chromosomes mus rau txhua tus ncej thaum lub sij hawm anaphase II, tus muam chromatids mus rau txhua tus ncej. Anaphase I tshwm sim thaum lub sij hawm meiosis I thaum lub sij hawm anaphase II tshwm sim thaum meiosis II. Li no, qhov no kuj yog qhov sib txawv ntawm anaphase I thiab anaphase II. Tsis tas li ntawd, anaphase I coj qhov chaw thaum lub cell nyob rau hauv lub xeev diploid thaum lub anaphase II tshwm sim thaum lub cell nyob rau hauv lub haploid lub xeev. Yog li, nws yog lwm qhov sib txawv ntawm anaphase I thiab anaphase II.
Ntxiv mus, qhov sib txawv ntxiv ntawm anaphase I thiab anaphase II yog qhov sib txuas nrog cov centromeres. Hauv anaphase, kuv, centromeres ntawm homologous chromosomes txuas nrog spindle fibers yog li ob lub spindle fibers txuas rau lub centromeres ntawm txhua homologous chromosome. Ntawm qhov tod tes, hauv anaphase II, ob leeg spindle fibers txuas rau tib chromosome. Tsis tas li ntawd, thaum lub sij hawm anaphase, kuv, centromeres ntawm cov chromosomes tsis sib cais thaum lub sij hawm anaphase II, centromeres phua thiab tus muam chromatids cais nyob rau hauv txhua chromosome. Li no, nws kuj yog qhov sib txawv ntawm anaphase I thiab anaphase II.
Cov duab hauv qab no nthuav tawm cov ntsiab lus ntxiv ntawm qhov sib txawv ntawm anaphase I thiab anaphase II.
Summary – Anaphase I vs Anaphase II
Meiosis yog ib qho ntawm ob lub cell faib. Nws tsim plaub tus ntxhais ntawm ib lub xov tooj ntawm niam txiv. Txhua lub cell muaj ib nrab ntawm cov chromosomes ntawm niam txiv cell. Meiosis tshwm sim ntawm ob txheej txheem tseem ceeb; meiosis I thiab meiosis II. Txhua meiosis muaj plaub pawg. Anaphase I tshwm sim hauv meiosis I thaum anaphase II tshwm sim hauv meiosis II. Qhov sib txawv tseem ceeb ntawm anaphase I thiab anaphase II yog tias thaum lub sij hawm anaphase I, homologues chromosomes raug rho tawm thiab txav mus rau sab nraud ntawm tes thaum lub sij hawm anaphase II, tus muam chromatids ntawm txhua tus chromosome tau sib cais thiab raug rub mus rau cov ncej.. Tsis tas li ntawd, anaphase I tshwm sim thaum lub cell nyob hauv lub xeev diploid thaum lub anaphase II tshwm sim thaum lub cell nyob rau hauv lub xeev haploid. Yog li, qhov no qhia txog qhov sib txawv ntawm anaphase I thiab anaphase II.
