Masiqale ngesingeniso se-anatomical. I-spermatozoa yindoda iyahlula iindidi ezimbini:
- kunye neeseti ze-chromosomes;
- kunye neethayi ze-chromosomes.
Amantombazana azalwa ngokuhlanganiswa kwe-X-chromosomes (XX), kunye namakhwenkwe avela kudibaniso lwe-X ne-Y (XY). Njengoko unokubona, ukuba unomdla kwindlela yokukhulelwa kwinkwenkwe ngokuchanekileyo, kufuneka uqinisekise ukugqithisa kwinqanaba le-Y-spermatozoon.
Siza kubona indlela yokwenza oku.
Phela
I-X-spermatozoa ihlala ifike kwiintsuku ezingama-5 kwimimandla ye-acidic yobundlobongela besifazane, ihamba ngokukhawuleza kwaye ibe nobukhulu obukhulu-amathuba okuphila aphezulu. I-Y-spermatozoa ihlala iiyure ezingama-24, zincinci kwaye zikhawuleza.
Ngoko, kunjani ukukhulelwa kwinkwenkwe, ngokuqonda oku ngasentla? I-pose ifanele ikhuthaze i-ejaculation esondeleyo kwisibeletho, ukwenzela ukuba i-spermatozoa kunye ne-Y "iphumelele" umncintiswano kwi-X-spermatozoa.
Ukwenza oku, zonke iimeko ezifanelekileyo, apho ibhinqa livela ngaphantsi kwaye apho indoda ingena khona ipilisi ngokukhawuleza kunokwenzeka.
Eyona nto idume kakhulu kwaye ihlolwe:
- "Umvangeli wevangeli";
- isithuba se "style doggy" - ibhinqa limi kuzo zonke iine, indoda ingena kwisondo emva kwayo;
- ukufaka "isipuni" - zombini amaqabane alala kwicala lawo, indoda ingena emva.
Ukusuka kwindlela yokujonga ngayo i-physiology, abafazi kufuneka banake ingqalelo kwiimeko zokubethwa kwesibeletho :
ukuba kukho i-bend, misela ukuba yiyiphi indlela kwaye ulala ngapha nangapha ukuze ukhulelwe; Ukuba umlomo wesibeleko ukhona ngaphezu kwesiqhelo - uya kufikelela kwindawo yokuguqa ngamadolo.
Nini?
Kodwa i-positi ayikho isiqinisekiso esipheleleyo. Xa uqwalasela umbuzo wendlela yokucwangcisa kakuhle umntwana umntwana, qwa lasela umtshato wesini.
Ukukhulelwa kwamakhwenkwe amakhwenkwe athande iiyure ezingama-24 ngaphambi kokuqala kwe-ovulation kunye namahora angama-12 emva kokuvutha.
Kwakhona, isizathu esisekufutshane ubomi bukaY-spermatozoa, kunye nokulondoloza ixesha elide le-X-spermatozoon kwisisini. Ukongezelela, kunconywa ubuncinane ubuncinci beentsuku ezimbini zokubamba , ukwenzela ukuba ibhinqa ngexesha lokukhulelwa ayiphumeleli ngengozi i-X-chromosome ukusuka kwisondo sangaphambili sesondo.