Qhov sib txawv tseem ceeb ntawm kev faib ua vaj huam sib luag thiab kev faib txo qis yog qhov sib npaug sib faib hais txog meiosis II, thaum lub sij hawm tus lej chromosomal tseem sib npaug li haploid. Hauv qhov sib piv, kev faib txo qis yog hais txog meiosis I, thaum lub sijhawm tus lej chromosome txo mus rau ib nrab ntawm lub xeev diploid.
Meiosis yog txheej txheem tseem ceeb hauv kev sib deev. Nws pab txhawb kev tsim cov haploid gametes txhawm rau ua kom cov khoom siv caj ces zoo ib yam hauv txhua tiam ib tiam dhau los. Nws kuj ua kom muaj kev tsim cov noob caj noob ces gametes, uas tsim cov kev hloov pauv caj ces. Meiosis tshwm sim ntawm ob qhov kev faib ua meiosis I thiab meiosis II. Thaum lub sij hawm meiosis I, tus lej chromosome raug txo los ntawm diploid mus rau haploid. Yog li no, peb hu qhov kev faib txo qis. Thaum lub sij hawm meiosis II, tus lej chromosome tseem nyob raws li nws nyob hauv lub xeev haploid. Li no, peb hu qhov kev faib no yog kev faib ua vaj huam sib luag.
Dab tsi yog Equational Division?
Kev faib ua vaj huam sib luag yog kev faib thib ob ntawm meiosis. Nws tseem hu ua meiosis II. Kev faib ua vaj huam sib luag pib los ntawm ob lub hlwb haploid uas tsim los ntawm kev txo qis. Los ntawm ob lub hlwb haploid, plaub lub hlwb haploid raug tsim nyob rau theem no. Tsis muaj kev hloov pauv ntawm tus lej chromosome ntawm tus ntxhais cell. Peb hu rau theem no sib npaug sib faib vim nws tsis hloov tus lej chromosome ntawm cov hlwb.
Daim duab 01: Kev Sib Txuas Sib Txuas
Kev faib ua vaj huam sib luag zoo li mitotic cell division. Thaum sib npaug sib faib, ib tus neeg chromosomes kab ntawm lub phaj metaphase yam tsis tau ua ke nrog cov chromosomes homologous. Thaum lub sij hawm anaphase, centromeres phua thiab tus muam chromatids cais ntawm ib leeg. Muam chromatids mam li tsiv mus rau cov opposite ncej. Yog li ntawd, tus lej chromosome tseem nyob tas li (n) raws li lub xov tooj dhau los. Thaum kawg ntawm qhov sib npaug sib faib, plaub lub hlwb haploid raug tsim.
Kev Txom Nyem yog dab tsi?
Kev txo qis yog thawj zaug ntawm meiosis. Nws tseem hu ua meiosis I. Raws li lub npe qhia, tus lej chromosome txo qis hauv ib nrab. Yog li ntawd, tus lej chromosome txo qis los ntawm diploid (2n) mus rau haploid (n) lub xeev thaum lub sij hawm txo kev faib. Muaj qhov sib cuam tshuam ntev ua ntej meiosis I. Kev txo qis tshwm sim ntawm plaub ntu: prophase I, metaphase I, telophase I thiab anaphase I.
Daim duab 02: Kev txo qis
Lub sijhawm prophase I, homologous chromosomes paub ib leeg thiab ua khub. Tom qab ntawd lawv tsim tetrads thiab pauv lawv cov khoom siv caj ces ntawm lawv. Thaum lub sij hawm prophase I, genetic recombination tshwm sim. Genetic recombination ua rau muaj kev hloov pauv ntawm caj ces hauv ib hom. Thaum lub sij hawm anaphase I, homologous chromosomes migrate mus rau lub opposite ncej. Txij li thaum homologous chromosomes tsiv mus rau hauv txhua tus ncej, tus lej chromosome ua ib nrab. Txhua tus ntxhais ntawm tes tsuas muaj ib daim qauv ntawm txhua tus chromosome. Thaum kawg ntawm kev txo qis, ob lub hlwb haploid tau tsim. Kev faib txo qis yog ua raws li kev faib ua vaj huam sib luag.
Dab tsi zoo sib xws ntawm Equational Division thiab Reduction Division?
- Kev faib ua vaj huam sib luag thiab kev txo qis yog ob qhov kev faib meiosis.
- Ob txoj kev faib ua cov hlwb haploid.
- Kev txo qis yog ua raws li kev faib ua vaj huam sib luag.
- Ob txoj kev faib muaj plaub ntu.
- Tsis muaj kev cuam tshuam ntawm ob pawg no.
- Lawv tshwm sim hauv cov txheej txheem kev sib deev, thaum lub sijhawm sib deev ntawm tes hauv spermatogenesis thiab oogenesis.
- Cov menyuam ntxhais uas ua rau txhua qhov kev faib yog cov caj ces txawv.
Dab tsi yog qhov sib txawv ntawm Kev Sib Txuas Sib Txuas thiab Kev Txom Nyem?
Hauv kev faib ua vaj huam sib luag, cov khoom siv caj ces kis sib npaug rau hauv cov menyuam ntxhais. Hauv kev txo qis, cov khoom siv caj ces txo qis hauv ib nrab thiab xa mus rau cov menyuam ntxhais. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm kev sib npaug thiab kev txo qis. Tsis tas li ntawd, plaub tus ntxhais lub hlwb raug tsim tawm thaum kawg ntawm kev faib ua vaj huam sib luag, thaum ob tug ntxhais hlwb raug tsim tawm thaum kawg ntawm kev txo qis.
Ntxiv mus, homologous chromosome pairing thiab genetic recombination tshwm sim thaum lub sij hawm txo kev faib thaum lawv tsis tshwm sim nyob rau hauv kev sib npaug sib faib. Yog li, qhov no yog lwm qhov sib txawv ntawm qhov sib npaug thiab qhov txo qis.
Cov hauv qab no infographic teev tag nrho qhov sib txawv tseem ceeb ntawm kev sib npaug thiab kev txo qis hauv daim ntawv teev npe.
Summary – Equational Division vs Reduction Division
Ob qhov kev faib ntawm cov khoom siv caj ces tshwm sim thaum lub sijhawm meiosis. Cov kev faib no yog hu ua kev faib txo qis (meiosis I) thiab kev faib ua vaj huam sib luag (meiosis II). Hauv kev txo qis, tus lej chromosome raug txo mus rau ib nrab. Hauv kev faib ua vaj huam sib luag, tus lej chromosome tseem nyob hauv lub xeev haploid yam tsis muaj kev txo qis. Cov khoom siv noob caj noob ces kis sib npaug rau hauv plaub tus ntxhais. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm kev sib npaug thiab kev faib txo qis.
