Video: Qhov txiaj ntsig tseem ceeb ntawm meiosis yog dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Lus Nug: Ib tseem ceeb tshwm sim ntawm meiosis yog tias: gametes tau txais ib daim qauv ntawm txhua tus tswv cuab ntawm txhua khub ntawm homologous chromosomes. gametes yog tsim uas yog diploid. txhua gamete tau txais ib tug tswv cuab ntawm txhua khub ntawm homologous chromosomes thiab gametes yog tsim uas haploid.
Tsis tas li ntawd, qhov tshwm sim tseem ceeb ntawm meiosis yog dab tsi?
Nyob rau hauv sib piv rau ib tug mitotic division, uas yields ob zoo tib yam diploid ntxhais hlwb, qhov kawg. qhov tshwm sim ntawm meiosis yog haploid tus ntxhais hlwb nrog chromosomal ua ke sib txawv los ntawm cov uas muaj nyob rau hauv niam txiv. Hauv cov phev hlwb, plaub haploid gametes raug tsim.
Qhov tshwm sim ntawm meiosis hauv tib neeg yog dab tsi? Hauv tib neeg , meiosis yog cov txheej txheem uas cov phev hlwb thiab qe qe raug tsim. Hauv txiv neej, meiosis yuav tshwm sim tom qab puberty. Diploid hlwb nyob rau hauv lub testes undergo meiosis los tsim cov phev haploid nrog 23 chromosomes. Ib tug diploid cell yields plaub haploid phev hlwb los ntawm meiosis.
Kuj Paub, qhov txiaj ntsig tseem ceeb tshaj plaws ntawm meiosis 1 yog dab tsi?
Meiosis Nws yog ib qho tseem ceeb rau kev sib deev ntawm cov kab mob eukaryotic, ua kom muaj kev sib txawv ntawm caj ces los ntawm kev sib xyaw ua ke, thiab kho cov kab mob caj ces. Kev hla dhau los yog rov ua dua ntawm cov noob tshwm sim hauv prophase I ntawm meiosis Kuv yog ib qho tseem ceeb rau kev sib txawv ntawm cov noob caj noob ces.
Qhov kawg tshwm sim ntawm mitosis txawv li cas qhov kawg tshwm sim ntawm meiosis?
Mitosis tsim cov hlwb tshiab, thiab hloov cov hlwb uas qub, ploj lossis puas. Yuav ua li cas yog Qhov kawg tshwm sim ntawm mitosis txawv tshaj qhov kawg tshwm sim ntawm meiosis ? Cov txiaj ntsig mitosis nyob rau hauv ob tug ntxhais cell thaum cov txiaj ntsig meiosis hauv plaub tus ntxhais.
Pom zoo:
Dab tsi yog qhov txiaj ntsig tseem ceeb ntawm kev taw qhia ntawm tes los ntawm kev sib cuag lub cev ncaj qha?
Kev taw qhia kuj tshwm sim ntawm cov hlwb uas yog kev sib cuag ntawm lub cev. Kev sib cuam tshuam ntawm cov proteins ntawm qhov chaw ntawm cov hlwb tuaj yeem ua rau muaj kev hloov pauv hauv cov cwj pwm ntawm tes. Piv txwv li, cov proteins nyob rau saum npoo ntawm T-cells thiab antigen nthuav tawm cov hlwb sib cuam tshuam los ua kom muaj kev taw qhia hauv T-cells
Vim li cas qhov tseem ceeb ntawm qhov tseem ceeb?
Thaum koj pom tus nqi kiag li hauv qhov teeb meem lossis qhov sib npaug, nws txhais tau hais tias txhua yam nyob hauv tus nqi tiag tiag yog qhov zoo. Cov txiaj ntsig tsis zoo feem ntau siv rau hauv cov teeb meem cuam tshuam nrog kev nyob deb thiab qee zaum siv nrog qhov tsis sib xws. Qhov ntawd yog qhov tseem ceeb uas yuav tsum nco ntsoov nws zoo li qhov deb ntawm xoom
Ob qhov tseem ceeb ntawm lub voj voog ntawm tes yog dab tsi thiab dab tsi tshwm sim rau lub cell hauv txhua theem?
Muaj ob theem tseem ceeb hauv lub voj voog ntawm tes. Thawj theem yog interphase thaum lub cell loj hlob thiab replicates nws DNA. Qhov thib ob yog theem mitotic (M-Phase) thaum lub sijhawm cell faib thiab hloov ib daim qauv ntawm nws cov DNA mus rau ob lub hlwb zoo tib yam
Dab tsi yog 2 qhov tseem ceeb ntawm lub voj voog ntawm tes thiab dab tsi tshwm sim rau lub cell hauv txhua theem?
Cov xwm txheej no tuaj yeem muab faib ua ob qhov tseem ceeb: interphase (hauv nruab nrab ntawm kev sib faib theem ua pawg G1 theem, S theem, G2 theem), thaum lub xov tooj ntawm tes tsim thiab ua nrog nws cov haujlwm metabolic; mitotic theem (M mitosis), thaum lub sij hawm lub cell yog replicating nws tus kheej
Cov txiaj ntsig tseem ceeb yog dab tsi?
Qhov tseem ceeb tshaj plaws yog tus naj npawb ntawm cov ions tsis zoo uas sib npaug rau tus nqi ntawm cov hlau ion. Qhov thib ob valency yog tus naj npawb ntawm ligands uas txuas los yog sib koom ua ke rau hlau ion