Qhov txawv ntawm qe thiab phev yog dab tsi?

Raws li paub, kev sib deev hlwb, tsis zoo li cov neeg sawv cev, uas yog ib feem ntawm ntau yam kabmob thiab lub nruab, txawv, ua ntej ntawm tag nrho, los ntawm lawv cov specialization, uas muaj nyob rau hauv reproduction ntawm tom ntej tiam. Tias yog vim li cas lawv cov caj ces muaj pes tsawg leeg muaj lub haploid txheej chromosomes, i.e. ib nrab (23 chromosomes). Nyob rau tib lub sij hawm lub fetus yav tom ntej tau txais nyias cais los ntawm leej niam thiab leej txiv. Nws kuj tseem yuav tsum tau sau tseg tias tawm ntawm tag nrho cov zauv ntawm chromosomes tsuas yog 1 tus poj niam txiv neej chromosome pom cov kev sib deev tom qab ntawm tus me nyuam, vim hais tias 22 yog autosomes. Cia siv sij hawm ze ntawm tib neeg lub hlwb, thiab qhia koj txog qhov sib txawv ntawm ib tug poj niam deev ntawm tes, ib lub qe, ntawm phev cell.

Dab tsi yog cov yam ntxwv ntawm tus qauv ntawm txiv neej cov poj niam?

Li ntawd, spermatozoa, nyob rau hauv view ntawm lub fact tias lawv yuav tsum muaj highility rau fertilization, yog me me hlwb, uas nws lub cev yog elongated. Phev, nyob rau hauv sib piv rau ovum, tsis muaj ntau li cytoplasm. Nws muaj ib qho nucleus-uas yog hu ua ib lub taub hau, thiab ib daim ntawv cim npe (ploj), uas yog nws lub cev ntawm kev txav. Los ntawm cov txheej txheem sib txuas lus hauv cov kab mob sib kis, muaj cov tshuaj mitochondria uas muaj lub zog tsim nyog rau txoj kev khiav, qhov acrosomal vacuole (muaj cov enzymes rau dissolving lub hnab ntawv ntawm ib lub qe qe), qhov chaw ntsuag ntse nruab nrab. Tag nrho ntev ntawm cov kabmob no yog nyob rau thaj tsam 60 μm, uas tus Tsovrog yog 55 μm.

Thaum tawm hauv cov poj niam txiv neej caj dab, cov qog, cov phev tseem tsis paub qab hau, i.e. lawv tsis muaj mobility, tab sis lawv muaj peev xwm ua tiav morphologically. Yog li, lawv tsis muaj peev xwm fertilize. Ua kom cov txiv neej pw ua ke tshwm sim nyob rau hauv qhov system ntawm vas deferens.

Dab tsi nta ntawm tus qauv yog yam ntxwv ntawm cov poj niam kab mob ntawm tes?

Tus poj niam germ cell, lub qe, tsis zoo li cov phev txiv neej, yog loj heev nyob rau hauv qhov loj thiab tsis muaj mobility. Nws qhov ntev yuav ncav cuag 100-200 microns rau tib neeg. Qhov no yog ib nrab vim lub fact tias nws yog lub qe uas yog cia rau trophic kev sib txuas, uas tsuas yog tsim nyog rau txoj kev loj hlob ntawm lub embryo nyob rau theem kawg. Kuj, ntau tus cytoplasmic lug hauv nws muaj pes tsawg leeg yuav tsum muaj rau cov uas tsim thawj thawj cov cim ntawm embryonic hlwb - blastomeres.

Lub qe cell, nyob rau hauv sib piv rau cov kab xev, yog ib qho loj sib npaug nucleus, nyob rau hauv uas euchromatin (nucleoprotein thaj chaw ze rau qhov chaw ntawm lub nucleus, ntau despilized, lub luag hauj lwm rau cov hloov ntawm cov ntaub ntawv caj) predominates thiab muaj ib tug loj npaum li cas ntawm cyopathm. Nyob rau tib lub sij hawm mitochondria nyob rau hauv nws yog nyob rau hauv tsawg dua, uas yog tshwm sim los ntawm tsawg mobility ntawm poj niam txiv neej hlwb. Nws kuj yog tsim nyog sau cia tias tib neeg poj niam cov poj niam txiv neej tsis muaj kev txwv tsis pub raug. Qhov kev zam tsuas yog, tej zaum, qhov theem ntawm lawv qhov kev ua tiav, nyob rau theem ntawm ogony. Feem ntau, cov ovules nyob ze kev sib txuas nrog lub hlwb, uas, qhov tseeb, tsim ib txoj hlua txuas thiab epithelial membrane ncig txhua tus poj niam lub vev xaib. Txoj haujlwm no yog hu ua tus menyuam yug menyuam. Nws cov qauv yog qhov teeb meem nyob rau hauv tus txheej txheem ntawm oogenesis .

Tag nrho cov kev sib txawv ntawm cov qe los ntawm cov phev tsis muab tso rau hauv ib lub rooj, yog li cov no yog ob hom hlwb.

Dab tsi yog qhov tseem ceeb ntawm cov kab mob phev?

Muaj qhia txog seb lub qe yog qhov txawv ntawm spermatozoa thiab yog vim li cas, sib sau ua ke, Kuv xav sau cov ntsiab lus sib txawv. Ntawm lawv muaj:

Yog li, nws yuav hais tau tias lub ntsiab sib txawv ntawm lub spermatozoon los ntawm qe yog nyob rau hauv tus qauv, vim qhov txheeb raws roj ntsha tus nqi rau lawv.