Thaum lub sijhawm prophase I, cov chromosomes condense thiab pom hauv lub nucleus. Vim tias txhua tus chromosome tau muab luam tawm thaum lub sijhawm the S theem uas 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 duplicate?
Nyob rau hauv meiosis, chromosomes los yog chromosomes duplicate (thaum interphase) thiab homologous chromosomes pauv cov ntaub ntawv genetic (chromosomal crossover) thaum thawj faib, hu ua meiosis I. Ib zaug ntxiv hauv meiosis II, faib cov viv ncaus chromatids los ua haploid gametes.
Yuav ua li cas yog chromosome duplication tshwm sim?
Nyob rau hauv lub voj voog ntawm eukaryotic cell, chromosome duplication tshwm sim thaum "S theem" (theem ntawm DNA synthesis) thiab chromosome segregation tshwm sim thaum "M theem" (theem mitosis).
Puas chromosome duplication tshwm sim hauv meiosis?
Meiosis yog cov txheej xwm uas npaj thiab cais cov chromosomes thiab chromatids mus rau hauv cov menyuam ntxhais. Thaum lub sij hawm interphases ntawm meiosis, txhua chromosome yog duplicated.
Yuav ua li cas thaum chromosome duplication?
Lub txheej txheem ntawm kev tsim ob lub hlwb tshiab pib ib zaug ib lub xovtooj tau duplicate nws cov chromosomes. Hauv lub xeev noTxhua chromosome muaj ib tug sib koom ua ke ntawm tib yam replicas hu ua chromatids. Cov chromosomes condense thiab kab nyob rau hauv nruab nrab ntawm lub nucleus. Lub daim nyias nyias nyob ib puag ncig cov nucleus tawg thiab ploj mus.
