Video: Puas yog txo qis ntawm chromosomes tshwm sim hauv meiosis?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov kab mob hauv qab meiosis ua diploid. Kev txo qis ntawm chromosomes tshwm sim hauv meiosis -1 los tsim 2 lub hlwb uas dhau mus meiosis -2 los tsim plaub lub hlwb haploid (muaj ib nrab ntawm cov chromosomes ntawm lub cell uas undergoes meiosis ). Meiosis 2 zoo li mob mitosis.
Raws li txoj cai, thaum lub sij hawm twg ntawm meiosis yog tus lej chromosome?
Prophase II zoo ib yam rau mitotic prophase, tshwj tsis yog tias cov tus lej ntawm chromosomes yog txo los ntawm ib nrab thaum lub sij hawm meiosis Kuv.
Ib sab saum toj no, vim li cas thiaj li txo tus lej chromosome rau meiosis? Meiosis yog a txo division yog tsim nyog nyob rau hauv kev sib deev reproducing kab mob los tswj cov hom tus lej ntawm chromosomes . Gametes, lossis cov hlwb sib deev yuav tsum muaj ib nrab chromosomes uas niam txiv cell muaj. Thaum fertilization, ob gametes fuse ua ke los tsim cov xeeb ntxwv.
Ib yam li ntawd, tib neeg nug, yuav ua li cas rau chromosomes hauv meiosis?
Hauv meiosis , cov chromosome los yog chromosomes duplicate (thaum lub sij hawm interphase) thiab homologous chromosomes pauv genetic information ( chromosomal crossover) thaum thawj zaug, hu ua meiosis I. Cov ntxhais cell faib dua nyob rau hauv meiosis II, faib cov viv ncaus chromatids los tsim haploid gametes.
Muaj pes tsawg chromosomes nyob rau hauv meiosis?
Tus naj npawb ntawm chromosomes raug txo los ntawm 46 (23 khub) mus rau 23 thaum lub sij hawm tus txheej txheem ntawm meiosis. Vim tias lawv tsuas muaj ib nrab ntawm tag nrho cov chromosomes nyob rau hauv lub somatic cell, lawv hu ua haploid (n). Nyob rau hauv tib neeg lub qe los yog phev, muaj 23 chromosome , ib qho yog X lossis Y.
Pom zoo:
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