Video: Dab tsi yog qhov hla dhau thaum lub sijhawm prophase 1?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Hla mus tshwm sim ntawm prophase 1 thiab metaphase 1 thiab yog cov txheej txheem uas homologouschromosomes ua ke nrog ib leeg thiab sib pauv cov ntu sib txawv ntawm lawv cov khoom siv caj ces los ua cov chromosomes recombinant. Nws kuj tshwm sim thaum mitotic division, uas yuav ua rau inloss ntawm heterozygosity.
Hais txog qhov no, dab tsi tshwm sim thaum hla hauv prophase 1 ntawm meiosis?
Thaum theem ntawm no meiosis , chromosomes yuav pom, hla - tshaj tshwm sim , cov nucleolusdisappears, the meiotic spindle cov ntaub ntawv, thiab lub hnab ntawv nuclear ploj mus. Thaum pib ntawm prophase Kuv, thechromosomes twb duplicated. Hla - dhau yog cov txheej txheem uas tuaj yeem ua rau geneticrecombination.
Ib sab saum toj no, vim li cas kev hla dhau tshwm sim hauv prophase 1? Lwm yam kev hloov caj ces yog los ntawm hla kev , uas may tshwm sim thaum prophase kuv ofmeiosis. Hauv prophase Kuv ntawm meiosis, qhov hloov pauv homologouspair ntawm chromosomes tuaj ua ke hauv cov txheej txheem hu ua synapsis, thiab cov seem ntawm cov chromosomes sib pauv.
Ib yam li ntawd, koj tuaj yeem nug, Puas yog Kev Hla Dhau tshwm sim hauv prophase 1?
Kev hla dhau tshwm sim nruab nrab prophase Iand metaphase I thiab yog cov txheej txheem uas ob homologous chromosomenon-viv ncaus chromatids ua ke nrog ib leeg thiab sib pauv sib txawv ntawm cov khoom siv caj ces los ua ob tus muam chromosome recombinantchromosome.
Dab tsi tshwm sim thaum lub sijhawm prophase kuv?
Thaum lub sij hawm prophase I , lawv coil thiab ua shorterand thicker thiab pom nyob rau hauv lub teeb microscope. Duplicatedhomologous chromosomes khub, thiab hla dhau (kev sib hloov ntawm lub cev ntawm chromosome) tshwm sim . Lub hnab ntawv nuclear ploj lawm ntawm kawg ntawm prophase kuv , cia cov spindle nkag mus rau hauv lub nucleus.
Pom zoo:
Dab tsi yog tus lej ntawm lub sijhawm ntawm lub sijhawm?
Lub sij hawm nyob rau hauv daim ntawv periodic. Hauv txhua lub sijhawm (kab kab rov tav), cov lej atomic nce ntawm sab laug mus rau sab xis. Lub sijhawm yog suav 1 txog 7 nyob rau sab laug ntawm lub rooj. Cov ntsiab lus uas nyob rau tib lub sijhawm muaj tshuaj lom neeg uas tsis yog txhua yam zoo sib xws
Lub luag haujlwm ntawm lub cell membrane yog dab tsi thaum lub sijhawm thauj mus los?
Lub cell membrane yog xaiv permeable rau ions thiab organic molecules thiab tswj kev txav ntawm cov khoom hauv thiab tawm ntawm lub hlwb. Lub luag haujlwm tseem ceeb ntawm cov cell membrane yog los tiv thaiv lub cell ntawm nws ib puag ncig. Nws muaj phospholipid bilayer nrog embedded proteins
Dab tsi yog qhov txawv ntawm mitosis thiab meiosis thaum lub sij hawm prophase?
Mitosis: Thaum thawj theem mitotic, hu ua prophase, chromatin condenses rau hauv cov chromosomes discrete, lub hnab ntawv nuclear tawg, thiab spindle fibers tsim ntawm cov ncej ntawm lub cell. Ib lub xovtooj siv sijhawm tsawg dua hauv prophase ntawm mitosis dua li lub xovtooj ntawm prophase I ntawm meiosis
Qhov txawv ntawm prophase 1 thiab prophase 2 yog dab tsi?
Prophase I yog theem pib ntawm Meiosis Iwhile Prophase II yog theem pib ntawm Meiosis II.Nws muaj qhov cuam tshuam ntev ua ntej Prophase I, qhov Prophase II tshwm sim yam tsis muaj kev cuam tshuam. Kev sib koom ua ke ntawm homologous chromosomes tshwm sim hauv Prophase I, qhov txheej txheem no tsis tuaj yeem pom hauv Prophase II
Lub sijhawm twg ntawm meiosis hla dhau tshwm sim?
Kev piav qhia: Thaum chromatids 'hloov dhau,' homologous chromosomes pauv cov khoom siv caj ces, ua rau muaj kev sib txuas tshiab ntawm alleles, txawm tias tib cov noob tseem nyob. Hla dhau tshwm sim thaum lub sij hawm prophase I ntawm meiosis ua ntej tetrads tau ua raws li txoj kab nruab nrab hauv metaphase I