Izixhobo zesakhiwo segetete
Iiseli zesini, xa kuthelekiswa nesiqhelo, somatic, zininzi ezahlukeneyo. Eyona nto ibaluleke kakhulu yile i-haploid isethi yama-chromosomes, efumaneka ngokuthe ngqo kwi-nuclei yeeseli zesini ngokwazo. Oku kuqinisekisa ukuveliswa kwi-zygote yesethi ye-diploid ye-chromosomes yezinto eziphilayo, isiqingatha somama, isiqingatha soyise.
Kwakhona ama-gametes ahluke kwezinye iiseli ngobudlelwane obungavamile phakathi kwe-nucleus kunye ne-cytoplasm. Ngaphezu koko, kwi-spermatozoa iphezulu kunama-oocytes. Oku kubangelwa kukuba kwi-spermatozoa inani le-cytoplasm lincinci, xa kuthelekiswa ne-ovule, eliqule inani elikhulu kunye nezondlo ekuphuhliseni imbungu.
Ukongezelela, ngokungafani neeseli ze-somatic, iiseli zesini zibonakaliswe ngezinga eliphantsi leenkqubo zokuxilisa.
Yiyiphi imisebenzi yamaseli esini zesini?
Eyona nto iphambili kwaye, mhlawumbi, yodwa umsebenzi we-spermatozoa, ityala. I-Sperm, idibanisa neqanda, ibone ngekhethi ye-haploid yeema-chromosomes, okuyimfuneko ekuphuhlisweni kwembungu.
Yiyiphi imisebenzi yeeseli zesini zesini?
Xa kuthelekiswa neseli yesini yesini, imisebenzi yayo iququzelelwe kuphela ekukhuliseni iqanda kunye nokubonelelwa kwezinto eziphathekayo kuzo, iiseli zokuzala ezithatha inxaxheba enkulu ekukhulelweni.
Ngoko ke, iqanda linika i-fetus ezinezondlo kwixesha elizayo, ukwenza umsebenzi we-trophic, ngaphezu koko, igobolondo leqanda ngaphambi kokubunjwa kwe-zygote kwakhona yenza umsebenzi okhuselekileyo.