2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Thaum spermatogenesis, plaub cov phev tshwm sim los ntawm txhua tus thawj spermatocyte. Meiosis pib nrog lub cell hu ua thawj spermatocyte. Thaum kawg ntawm thawj qhov kev faib meiotic, a haploid cell yog tsim hu ua cov spermatocyte thib ob. Lub xovtooj ntawm no yog haploid thiab yuav tsum dhau mus rau lwm qhov kev faib cell meiotic.
Yuav ua li cas yog qhov kawg ntawm thawj meiotic division?
Ob lub hlwb haploid yog qhov kawg tshwm sim ntawm thawj qhov kev faib meiotic. Cov hlwb yog haploid vim ntawm txhua tus ncej, tsuas yog ib qho ntawm txhua khub ntawm homologous chromosomes. Yog li ntawd, tsuas yog ib qho tag nrho ntawm chromosomes tam sim no.
Yuav ua li cas yog thawj qhov kev faib meiotic?
Qhov tshwm sim ntawm thawj lub cell faib yog ob lub hlwb ywj pheej. Ib lub cell muaj cov niam txiv homologous khub, los yog tus muam chromatids, nrog ib ntu me me ntawm leej txiv chromosome los ntawm kev sib tw. Lwm lub xovtooj muaj cov niam txiv homologous khub nrog ib ntu me me ntawm niam txiv chromosome.
Thaum thawj qhov kev faib meiotic tshwm sim?
Thawj meiotic faib pib nrog a ntev prophase, uas tau faib ua tsib theem. Thaum lub sij hawm leptotene (Greek, "thin thread") theem, chromatin ntawm chromatids yog ncab tawm heev, thiab nws tsis tuaj yeem txheeb xyuas tus neeg chromosomes.
Qhov twg feem ntau tshwm sim hauv thawj qhov kev faib meiotic?
In meiosis, thechromosomes los yog chromosomes duplicate (thaum lub sij hawm interphase) thiab homologous chromosomes pauv genetic ntaub ntawv (chromosomal crossover) thaum thawj zaug, hu ua meiosis I. Cov ntxhais hlwb faib dua nyob rau hauv meiosis II, splitting tus muam chromatids. tsim haploid gametes.
Pom zoo:
Puas faib nyiaj faib ua cov nyiaj tau los?
Txhua cov nyiaj tau los them rau cov tswv lag luam yuav tsum suav nrog lawv cov nyiaj tau los tag nrho, tab sis cov nyiaj faib tsim nyog yuav tau txais kev kho se zoo dua. Ib qho nyiaj faib uas tsim nyog tau them se ntawm cov peev nyiaj tau los ntawm tus nqi se, thaum cov nyiaj faib tawm tau raug them se ntawm tsoomfwv cov nyiaj tau los tus qauv.
In oogenesis thib ob meiotic faib pib?
Thib ob meiotic faib hauv cov poj niam qe tsis tau ua tiav ua ntej cov phev nkag. Yog li ntawd, qhov thib ob meiotic division yuav siv qhov chaw tom qab ovulation, nyob rau hauv lub fallopian tube. Raws li cov phev taub hau nkag mus rau hauv qe cytoplasm, qhov thib ob meiotic division pib mus rau nws theem kawg, muab tawm ib tug thib ob polar lub cev.
Tus thawj tswj hwm twg tau saib xyuas lub sijhawm kawg ntawm kev tsim kho dua tshiab?
Raws li Thawj Tswj Hwm 19th ntawm Tebchaws Meskas (1877-1881), Rutherford B. Hayes saib xyuas qhov kawg ntawm Kev Tsim Kho, pib cov kev siv zog uas coj mus rau kev hloov kho pej xeem, thiab sim kom rov sib haum xeeb ntawm kev sib cais uas tseem tshuav los ntawm Tsov Rog Tsov Rog.
Tus lej twg yog qhov kawg ntawm qhov kev faib ua feem?
Yuav kom pom cov khoom hla ntawm qhov kev faib ua feem, peb muab cov ntsiab lus sab nraud, hu ua qhov siab, thiab cov ntsiab lus nruab nrab, hu ua txhais tau tias. Ntawm no, 20 thiab 5yog qhov siab tshaj, thiab 25 thiab 4 yog txhais tau. Tus lej piv txwv yog dab tsi?
Leej twg yog tus thawj tswj hwm zaum kawg ntawm Is Nrias teb?
Louis Mountbatten, Earl Mountbatten ntawm Burma los ua tus thawj tswj hwm thiab saib xyuas kev hloov pauv ntawm British Is Nrias teb rau kev ywj pheej. Chakravarti Rajagopalachari (1878-1972) tau los ua tus Indian nkaus xwb thiab tus thawj tswj hwm kawg tom qab kev ywj pheej.
