Qhov sib txawv tseem ceeb ntawm prophase I thiab prophase II yog tias prophase I yog theem pib ntawm meiosis I, thiab muaj qhov cuam tshuam ntev ua ntej nws thaum prophase II yog thawj theem ntawm meiosis II yam tsis muaj interphase ua ntej. rau nws.
Mitosis thiab meiosis yog ob qhov kev faib cell tseem ceeb tshwm sim hauv txhua yam kab mob nyob. Ntawm lawv, meiosis yog txheej txheem tseem ceeb rau kev sib deev. Txhawm rau kom muaj kev sib deev ua tiav, nws yog ib qho tsim nyog los tsim gametes uas muaj ib nrab ntawm cov chromosome tus naj npawb ntawm cov xov tooj ntawm tes. Txhua eukaryotes muaj tus lej chromosome tshwj xeeb rau txhua hom.
Yuav kom tswj tau tus lej chromosome nyob rau hauv tus nqi tas li ntawm ib tiam mus rau lwm tus, nws yog ib qho tseem ceeb kom txo tau tus lej chromosome los ntawm ib nrab ntawm gametes thiab tau txais tag nrho cov nyiaj tom qab fertilization. Qhov kev xav tau no yooj yim los ntawm meiosis. Meiosis muaj ob qhov kev faib tawm nuclear tom qab. Lawv hu ua meiosis I thiab meiosis II. Thaum kawg ntawm meiosis, nws tsim plaub haploid gametes. Meiosis kuv txo qis ploidy theem thaum meiosis II faib cov ntxhais cov hlwb los ntawm cov txheej txheem mitosis zoo li. Meiosis I muaj plaub theem hu ua prophase I, metaphase I, anaphase I, thiab telophase I. Zoo ib yam li ntawd, meiosis II kuj muaj plaub theem hu ua prophase II, metaphase II, anaphase II, thiab telophase II.
Prophase kuv yog dab tsi?
Prophase I yog thawj theem ntawm Meiosis I. Muaj qhov cuam tshuam ntev ua ntej prophase I. Thaum lub sijhawm prophase I, chromosomes pom, thiab lawv synapse los tsim tetrads. Qhov tshwm sim tetrads muaj ob khub ntawm chromosomes, yog li lub npe bivalents. Kev hla dhau yog lwm txoj kev tseem ceeb uas tshwm sim hauv prophase I thiab tso cai rau cov chromosomes pauv cov khoom siv caj ces thiab tsim cov caj ces sib txawv los yog cov caj ces sib txawv gametes.
Daim duab 01: Meiosis
Cov kev hla dhau ntawm lub cev sib txuas hauv homologous chromosomes yog Chiasmata, thiab lawv tseem ceeb heev hauv kev tsim cov noob caj noob ces cov noob caj noob ces. Kev ploj ntawm lub hnab ntawv nuclear, txav spindle fibers rau hauv nruab nrab, thiab txuas cov tetrads mus rau spindle fibers los ntawm kinetochore yog lwm yam xwm txheej uas tshwm sim hauv prophase I.
Prophase II yog dab tsi?
Prophase II tuaj yeem pom hauv Meiosis II. Nws yog theem pib ntawm lwm qhov kev faib tawm ntawm tes tom qab meiosis I. Tsis zoo li ua ntej prophase I, tsis muaj interphase ua ntej prophase II. Li no, prophase ii ncaj qha pib tom qab telophase I. Cov txheej txheem no zoo ib yam li prophase pom hauv Mitosis, hauv ntau yam. Qhov txawv tsuas yog tias cov hlwb muaj ib nrab ntawm cov chromosomes hauv prophase II. Tsis tas li, cov txheej txheem ntawm kev sib txuas chromosomes tsis tuaj yeem pom ntawm no.
Daim duab 02: Prophase II hauv Meiosis II
Kev tawg ntawm lub hnab ntawv nuclear, uas tsim hauv telophase kuv kuj tshwm sim nyob rau theem no. Hla thiab chiasmata tsim tsis tshwm sim hauv prophase II. Tsis tas li ntawd, kev sib xyaw ntawm cov khoom siv caj ces kuj tsis tshwm sim hauv prophase II.
Qhov Zoo sib xws ntawm Prophase I thiab Prophase II yog dab tsi?
- Prophase I thiab II yog theem ntawm meiosis.
- Ob leeg yog cov txheej txheem tseem ceeb ntawm kev sib deev thiab kev tsim gamete.
Qhov txawv ntawm Prophase I thiab Prophase II yog dab tsi?
Meiosis muaj ob qhov kev faib ua tiav nuclear uas yog meiosis I thiab meiosis II. Txhua meiosis muaj plaub theem. Prophase I yog theem pib ntawm meiosis I thaum prophase II yog thawj theem ntawm meiosis II. Qhov no yog qhov sib txawv tseem ceeb ntawm prophase I thiab prophase II. Lwm qhov sib txawv ntawm prophase I thiab prophase II yog qhov muaj peev xwm hla dhau thiab sib xyaw cov khoom siv caj ces. Hauv prophase, kuv, hla ntawm homologous chromosomes tshwm sim, thiab kev sib xyaw ntawm cov khoom siv caj ces tshwm sim thaum ob qho tib si tsis tuaj yeem ua tau hauv prophase II.
Cov hauv qab no infographic tabulates qhov sib txawv ntawm prophase I thiab prophase II kom meej ntxiv.
Summary – Prophase I vs Prophase II
Prophase I thiab prophase II yog ob theem loj ntawm meiosis. Prophase I yog thawj theem ntawm meiosis I thaum prophase II yog thawj theem ntawm meiosis II. Qhov no yog qhov sib txawv loj ntawm prophase I thiab prophase II. Prophase I tshwm sim tom qab interphase thaum prophase II tshwm sim tom qab telophase I. Qhov no yog lwm qhov txawv ntawm prophase I thiab prophase II. Tsis tas li ntawd, thaum lub sij hawm prophase I, homologous chromosomes khub thiab tsim tetrads thiab pauv cov khoom siv caj ces ntawm ib leeg. Tab sis qhov no tsis tshwm sim hauv prophase II. Yog li, qhov no qhia txog qhov sib txawv ntawm prophase I thiab prophase II.
