Zvichitevedzwa zvemugariro wegetete
Zvepabonde masero, mukuenzanisa neanowanzo, somatic, ane zvakawanda zvakasiyana. Iyo inonyanya kukosha pane iyi inonzi haploid yekromosomes, iyo inowanikwa zvakananga mumusana wezvirwere zvepabonde pachavo. Izvi zvinogadzirisa kubereka muzygote yezvinyorwa zvechidimbu zvinokonzerwa nema chromosomes kune mhuka, i.e. hafu yeamai, hafu yebaba.
Uyewo ma gametes akasiyana kubva kune mamwe masero neukama husina kujairika pakati pekasi uye cytoplasm. Uyezve, mu spermatozoa yakakwirira kudarika maoocyte. Izvi zvinonyanya kukosha nokuti mu spermatozoa muwandu we cytoplasm shoma, mukuenzanisa ne ovule, iyo ine nhamba yakakura yayo ine mishonga yekukudziridza embryo.
Mukuwedzera, kusiyana nemasero emasitendi, masero ezvirwere anozivikanwa nehuwandu hwehutachiona hwemagetsi.
Ndezvipi zvinoshandiswa nemurume weshure?
Iyo huru uye, zvichida, iyo chete inoshanda ye spermatozoa, inobereka. Uhu, hubatana neii, uvape pamwe ne haploid yavo yekromosomes, iyo inofanirwa mukugadzirwa kwembryo.
Ndezvipi zvinoshandiswa nevakadzikadzi zvepabonde masero?
Mukuenzanisa nemurume wesero rekuita zvepabonde, iro basa rake rinongowanikwa chete mukudyarwa kweii uye kupiwa kwezvakaberekwa, maitiro emadzimai ekubereka anoita basa guru mukuberekwa.
Saka, iyo iri inopa egg fetus neyemigirisi yeramangwana, ichiita trophic function, uyezve, yeiyo shell musati maumbwa zygote zvakare anoita basa rinodzivirira.