Video: Dab tsi cell tsim gametes?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Txiv neej gametes (spermatozoa) yog ua los ntawm hlwb (spermatogonia) nyob rau hauv lub seminiferous tubules ntawm lub testes thaum lub sij hawm spermatogenesis (Fig. 4.2).
Yog li ntawd, qhov twg gametes tsim?
Cov kab mob tshiab yog ua thaum txiv neej thiab poj niam haploid gametes fuse. Hauv cov tsiaj txhu, gametes yog ua nyob rau hauv cov noob qes lossis zes qe menyuam ntawm cov tib neeg tab sis anthers thiab zes qe menyuam yog nyob rau tib lub paj ntoo.
Tom qab, lo lus nug yog, gametes ua li cas? Tsim ntawm Gametes Ob tug txiv neej thiab poj niam gametes yog tsim Thaum lub sij hawm tus txheej txheem ntawm cellular reproduction hu ua meiosis. Thaum lub sij hawm meiosis, DNA tsuas yog replicated los yog theej ib zaug. Txawm li cas los xij, cov hlwb tau muab faib ua plaub lub hlwb. Cov gametes yog cov hlwb haploid vim lawv tsuas muaj ib pawg chromosomes xwb.
Xav txog qhov no, qhov twg gametes tsim hauv tib neeg yog gametes haploid lossis diploid thiab vim li cas?
Gametes muaj ib nrab ntawm cov chromosomes uas muaj nyob rau hauv ib txwm diploid cell ntawm lub cev , uas tseem hu ua somatic hlwb. Haploid gametes yog ua thaum lub sij hawm meiosis, uas yog ib hom kev faib cell uas txo cov chromosomes hauv niam txiv. diploid cell los ntawm ib nrab.
Dab tsi yog gametes tsim los ntawm?
Poj niam gametes tseem hu ua qe lossis ov. Lawv raug tsim thaum lub sij hawm cellular reproduction txheej txheem hu ua meiosis . Qhov tshwm sim gamete cell yog lub cell haploid. Thaum ob lub hlwb haploid, qe thiab phev, fuse ua ke thaum lub sij hawm fertilization, qhov tshwm sim yog ib lub cell diploid hu ua zygote.
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