Tom qab ntawd, ntawm qhov tseem ceeb thaum lub sijhawm interphase (hu ua S theem), lub xovtooj ntawm tes duplicates nws cov chromosomes thiab xyuas kom nws cov kab ke npaj rau kev faib cell. Yog tias txhua yam xwm txheej zoo tagnrho, tam sim no lub cell tau npaj txav mus rau thawj theem ntawm mitosis.
Nyob rau theem twg hauv mitosis thiab meiosis yog cov chromosomes replicated?
Thaum lub sijhawm prophase I, cov chromosomes condense thiab pom hauv lub nucleus. Vim hais tias txhua tus chromosome tau muab luam tawm thaum lub sij hawm S theemuas tau tshwm sim ua ntej prophase I, txhua tus tam sim no muaj ob tus muam chromatids koom nrog ntawm centromere. Qhov kev npaj no txhais tau tias txhua tus chromosome muaj cov duab ntawm X.
theem twg ntawm meiosis ua chromosomes replicate?
Meiosis I. Meiosis yog ua ntej los ntawm kev sib cuam tshuam uas muaj peb theem. G1 theem (tseem hu ua thawj qhov sib txawv) pib theem no thiab tsom mus rau kev loj hlob ntawm tes. Theem S yog tom ntej, thaum lub sijhawm DNA ntawm chromosomes rov ua dua.
qhov txawv ntawm meiosis 1 thiab meiosis 2 yog dab tsi?
Meiosis yog kev tsim tawm plaub lub noob caj noob ces haploid tus ntxhais los ntawm ib lub xov tooj ntawm niam txiv diploid. … Hauv meiosis II, cov chromosomes no tau muab cais ntxiv mus rau cov muam chromatids. Meiosis Kuv suav nrog kev hla lossis rov ua dua ntawm cov khoom siv caj ces ntawm cov chromosome khub, thaum meiosis II tsis.
Vim li casmeiosis 2 puas tsim nyog?
Cell Cycle and Cell Division. … Cov hlwb yog diploid, yog li ntawd hauv xaj kom faib cov chromosomes sib npaug ntawm cov menyuam ntxhais kom lawv muaj ib nrab ntawm cov chromosome, Meiosis II yog qhov tsim nyog.
