Video: Vim li cas gametes tsuas muaj 23 chromosomes?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Tam sim no, rau tus me nyuam muaj 46 chromosomes , leej txiv thiab niam gamete muaj rau muaj 23 chromosomes , yog li ntawd thaum lawv fuse lawv muab raws nraim 46 chromosomes rau lawv tus menyuam. Ob gametes fusing tsim ib zygote uas nws thiaj li tsim ntau somatic hlwb.
Ntawm no, vim li cas thiaj muaj 23 chromosomes hauv tib neeg gamete?
Hauv tib neeg , n = np 23 . Gametes muaj ib nrab chromosomes muaj nyob rau hauv ib txwm diploid hlwb ntawm lub cev, uas tseem hu ua somatic hlwb. Haploid gametes yog tsim thaum lub sij hawm meiosis, uas yog ib hom cell division uas txo tus naj npawb ntawm chromosomes nyob rau hauv niam txiv diploid cell los ntawm ib nrab.
Ib yam li ntawd, vim li cas koj xav tias gamete tsuas muaj 23 chromosomes thiab tsis yog 46? Meiosis muaj ob kab ntawm cell faib tsis muaj DNA replication nyob nruab nrab. Cov txheej txheem no txo cov naj npawb ntawm chromosomes los ntawm ib nrab. Tib neeg hlwb muaj 23 khub ntawm chromosomes , thiab cwb chromosome hauv ib khub yog hu ua homologous chromosome . Yog li ntawd, gametes tsuas muaj 23 chromosomes , tsis 23 khub.
Tsis tas li ntawd, vim li cas gametes tsuas muaj ib pawg chromosomes?
Yog li ntawd thaum ob gametes tuaj ua ke, lawv chromosomes ua ke ua rau diploid (2n) tus naj npawb ntawm chromosomes.
Vim li cas nws tseem ceeb rau gametes kom muaj ib nrab ntawm diploid tus lej ntawm chromosomes?
Vim li cas thiaj tseem ceeb uas gametes muaj ib nrab tus tus naj npawb ntawm chromosomes dua li lwm cov cell hauv lub cev? -vim thaum phev thiab qe fuse, lub zygote tsim yuav muaj qhov qub diploid tus lej ntawm chromosomes yam ntxwv ntawm hom.
Pom zoo:
Vim li cas gametes muaj tus lej haploid ntawm chromosomes?
Teb: Vim gametes yog qe thiab phev, uas sib sau ua ib lub zygote. Yog tias ob leeg ntawm lawv yog diploid, zygote yuav muaj ob npaug ntawm cov chromosomes ib txwm. Yog li ntawd, txhawm rau tsim gametes, cov kab mob tau txais meiosis (los yog txo kev faib) los tsim cov hlwb haploid
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