Chii chakasiyana?
Mhedzisiro yekutanga pakati pe spermatogenesis uye ovogenesis ndeyekuti pakuwedzera padanho rekuberekwa, kusimwa, kukura, kunewo chechina - maitiro. Ndiyo panguva iyi apo masume ekubereka vana anoumba mafaira ekufambisa, semugumisiro wekuti vanowana chimiro chakasvibiswa, chinosunungura kufamba kwavo.
Chinhu chechipiri chinosiyanisa chinogona kunzi chiitiko chinenge chiri pachikamu chekuparadzaniswa kubva kune spermatocyte yekuraira 1, 4 masero ezvepabonde anowanikwa pakarepo, uye imwe chete yevakadzi inobereka sero yakagadzirirwa kubva kukutanga oocyte, yakagadzirira kubereka.
Pakufananidza nhoroondo ye 2 maitiro (oogenesis uye spermatogenesis), inofanirawo kuonekwa kuti meiosis yemasero epabonde kune vakadzi inocherechedza kunyange pamusana wekugadzira intrauterine, i.e. Vana vanozvarwa patsva nemaoocyte ekuraira kwekutanga. Kuwedzerwa kwekugadzirisa kwavo kunopera chete nekutanga kwekuita zvepabonde kwemusikana. Mune varume, zvisinei, kuumbwa kwepermatozoa kunoitika nguva dzose, munguva yose yekupera.
Chimwe chezvakasiyana mu spermatogenesis uye oogenesis inhengo inhengo yemuviri, kusvika pamamiriyoni makumi matatu evanhu spermatozoa inoumbwa zuva rega rega,
Inofanira kuonekwa zvakare kuti danho rekuberekwa panguva yekuitwa kwe spermatogenesis rinoitika nguva dzose, asi mu oogenesis inoguma pakarepo mushure mokuberekwa.
Kunyora chiitiko ichi che oogenesis uye spermatogenesis, ndinoda kuona kuti, nokuti kuumbwa kwamaoocyte kunotangira musikana asati aberekwa, uye kunopedzisa mazai mushure mekuberekwa, zvinhu zvinokuvadza zvinokonzera mamiriro ezvinhu zvinogona kukonzera kukanganisa kwezvisikwa muvana .