ʻO kēlā me kēia pēpē i hānau ʻia mai kahi hālāwai: ʻo ka oocyte ma ka ʻaoʻao o ka makuahine a me ka sperm ma ka ʻaoʻao o ka makuakāne. Lawe mai kēlā me kēia i kā lākou mau mea genetic:

• 22 chromosomes + hoʻokahi X chromosome no ka oocyte
• 22 chromosome + he X a ʻo Y chromosome no ka sperm

Hāʻawi ka fertilization i kahi hua i kapa ʻia he zygote, ka cell mua kahi i hoʻohui ʻia ai nā chromosomes makuahine a me ka makua. A laila hoʻopau ka genome: 44 chromosomes a me 1 mau chromosomes sex. Mai ka hui ʻana ma waena o ka hua manu a me ka sperm, ua hoʻoholo ʻia nā ʻano a pau o ke keiki: ke kala o kona mau maka, kona lauoho, ke ʻano o kona ihu, a me kāna wahine.

• inā he mea lawe ka sperm i ka chromosome X, lawe ka pēpē i ka lua XX: he kaikamahine.
• inā lawe ʻo ia i ka chromosome Y, loaʻa i ka pēpē ka pālua XY: he keikikāne.

No laila, pili loa ke kāne o ka pēpē i ka manawa kūpono, e pili ana i ka sperm e kūleʻa mua i ka hoʻomomona mua ʻana i ka oocyte.

Mai ka pule 6 o ka hāpai ʻana, hoʻokomo ʻia nā cell sex primitive i kahi e ulu ai nā ovaries a i ʻole testes ma hope. Akā inā ua hoʻopaʻa ʻia i ka genetically, i kēia manawa ʻaʻole i hoʻokaʻawale ʻia ke kāne o ka fetus. I nā keikikāne, ʻike ʻia ka penis i ka pule 12 o ka hāpai ʻana (14 WA - 3rd mahina), a i nā kaikamahine, hoʻomaka ka ʻōpū i ka pule 20 o ka hāpai ʻana (22 WA, 5th mahina) (1). No laila ma ka lua o ka hāpai ʻana i ke ultrasound (morphological ultrasound o 22 pule) hiki ke ʻike i ke kāne o ka pēpē.

• ke ʻano Shettles

Wahi a ka hana a ka mea olaola ʻAmelika Landrum Brewer Shettles, ka mea kākau o Pehea e koho ai i ke kāne o kāu pēpē2 (Pehea e koho ai i ke kāne o kāu pēpē), ʻoi aku ka mālie o ka sperm e lawe ana i ka chromosome wahine (X) a lōʻihi ke ola ʻana, ʻoiai ka sperm e lawe ana i ka chromosome kāne (Y) e hele wikiwiki a ola pōkole. No laila, ʻo ka manaʻo e hoʻonohonoho i ka moe kolohe e like me ka wahine i makemake ʻia: a hiki i 5 mau lā ma mua o ka ovulation e hoʻoikaika i ka spermatozoa kūpaʻa loa i mea e loaʻa ai kahi kaikamahine; i ka lā o ka ovulation a me nā lā ʻelua e hiki mai ana e hāpai i ka sperm wikiwiki loa no ke keikikāne. Hoʻohui ʻia kēia i nā ʻōlelo aʻoaʻo ʻē aʻe: pH o ka cervical mucus (alkaline me ka baking soda vaginal douche no ke keikikāne, acidic me ka ʻauʻau vīnega no ke kaikamahine), ka hohonu a me ke axis o ke komo ʻana, ke alo o kahi wahine orgasm a i ʻole, etc. Hōʻike ʻo Kauka Shettles he 75% ka nui o ka holomua… ʻaʻole i hōʻoia ʻia e ka ʻepekema. Eia hou, ʻaʻohe ʻokoʻa o nā ʻano hoʻolāʻau semen hou i ke anatomy a i ʻole ka wikiwiki o ka neʻe ʻana ma waena o X a Y sperm (3).

• ka papa hana

Ma muli o kahi noiʻi (4) i hana ʻia i ka makahiki 80 ma ka hale hoʻokipa hānai Port-Royal ma 200 mau wahine hāpai, ua hoʻomohala ʻia kēia ʻano e Dr François Papa a hāʻawi ʻia i ka lehulehu ma kahi puke (5). Hoʻokumu ʻia ia ma kahi meaʻai e hāʻawi ana i kekahi mau paʻakai mineral ma nā ʻāpana i wehewehe maikaʻi ʻia ma muli o ke kāne i makemake ʻia. ʻO ka meaʻai momona i ka calcium a me ka magnesium e hoʻololi i ka pH vaginal o ka wahine, kahi e pale ai i ke komo ʻana o Y spermatozoa i loko o ka hua, a no laila e ʻae ʻia ka loaʻa ʻana o kahi kaikamahine. ʻO ka mea ʻē aʻe, ʻo ka meaʻai nui i ka sodium a me ka potassium e ālai i ke komo ʻana o ka sperm X, e ʻoi aku ka maikaʻi o ka loaʻa ʻana o kahi keikikāne. Pono e hoʻomaka kēia meaʻai koʻikoʻi ma kahi o 2 a me ka hapa mahina ma mua o ka hāpai ʻana. Hāʻawi ka mea kākau i ka helu kūleʻa o 87%, ʻaʻole i hōʻoia ʻia e ka ʻepekema.

ʻO kahi haʻawina (6) i hana ʻia ma waena o 2001 a me 2006 ma 173 wahine i aʻo i ka pono o ka meaʻai ionic i hui pū ʻia me ka hoʻonohonoho ʻana o ka moekolohe e like me ka lā o ka ovulation. Hoʻohana pololei ʻia a hui pū ʻia, loaʻa i nā ʻano ʻelua he 81% kūleʻa kūleʻa, hoʻohālikelike ʻia me 24% wale nō inā ʻaʻole i hahai pololei ʻia nā ʻano hana ʻelua.