Nwa ọ bụla a mụrụ site na nzute: nke oocyte n'akụkụ nne na spam n'akụkụ nna. Onye ọ bụla na-eweta ihe mkpụrụ ndụ ihe nketa nke ya:

• 22 chromosomes + otu X chromosome maka oocyte
• 22 chromosomes + X ma ọ bụ Y chromosome maka spam

Fatịlaịza na-amụ akwa a na-akpọ zygote, cell mbụ nke chromosomes nke nne na nna jikọtara ọnụ. genome zuru ezu: 44 chromosomes na otu ụzọ chromosomes mmekọahụ. Site na nzukọ dị n'etiti akwa na spam, ihe niile e ji mara nwa ahụ ekpebielarị: agba nke anya ya, ntutu isi ya, ọdịdị imi ya, na n'ezie, mmekọahụ ya.

• Ọ bụrụ na spam bụ onye na-ebu X chromosome, nwa ahụ na-ebu XX ụzọ: ọ ga-abụ nwa agbọghọ.
• ọ bụrụ na o bu chromosome Y, nwa ahụ ga-enwe ụzọ XY: ọ ga-abụ nwoke.

Ya mere mmekọahụ nke nwa ọhụrụ na-adabere kpamkpam na ohere, dabere na spam ga-aga nke ọma n'ịgba fatịlaịza oocyte mbụ.

Site n'izu nke isii nke ime ime, a na-etinye mkpụrụ ndụ mmekọahụ oge ochie ebe ovaries ma ọ bụ testes ga-etolite ma emechaa. Ma ọ bụrụgodị na a na-edozi ya na genetically, n'oge a, mmekọahụ nke nwa ebu n'afọ na-anọgide na-enweghị ọdịiche. N'ime ụmụ nwoke, amụ na-apụta ìhè n'izu nke iri na abụọ nke ime (6 WA - ọnwa nke atọ), na ụmụ agbọghọ, ikpu na-amalite ịmalite n'izu nke iri abụọ nke ime (12 WA, ọnwa nke ise) (14). Ya mere, ọ bụ na ultrasound ime ime nke abụọ (morphological ultrasound nke izu 3) na ọ ga-ekwe omume ịmata mmekọahụ nke nwa ọhụrụ.

• usoro Shettles

Dị ka ọrụ nke American biologist Landrum Brewer Shettles, odee nke Otu esi ahọrọ mmekọ nwoke na nwanyị nke nwa gị2 (Otu esi ahọrọ ụdị mmekọahụ nke nwa gị), spam na-ebu chromosome nwanyị (X) na-aga n'ihu nwayọọ nwayọọ ma dị ogologo ndụ, ebe spam na-ebu chromosome (Y) na-aga n'ihu ngwa ngwa mana ọ dị mkpụmkpụ. Ya mere, echiche bụ ịhazi oge inwe mmekọahụ dịka nwoke na nwanyị chọrọ: ruo ụbọchị 5 tupu ovulation iji kwalite spermatozoa kachasị na-eguzogide iji nwee nwa nwanyị; n'ụbọchị ovulation na ụbọchị abụọ na-esote iji kwalite spam kacha ngwa ngwa maka nwa nwoke. Na nke a na-agbakwunyere ndị ọzọ Atụmatụ: pH nke cervical imi (alkaline na a mmiri soda ikpu douche maka nwa nwoke, acidic na mmanya ịsa ahụ maka nwa agbọghọ), omimi na axis nke penetration, ọnụnọ nke a nwanyi orgasm ma ọ bụ, wdg. Dr. Shettles na-akọ na ọ nwere ihe ịga nke ọma 75%… egosighi na sayensị. Na mgbakwunye, usoro nyocha mkpụrụ ndụ ọhụrụ egosila na ọ nweghị ihe dị iche na mmega ahụ ma ọ bụ ọsọ nke ije n'etiti sperm X ma ọ bụ Y (3).

• usoro nna

Dabere na ọmụmụ (4) emere na 80s na ụlọ ọgwụ Port-Royal na-amụ nwa na ụmụ nwanyị dị ime 200, usoro a bụ Dr François Papa mepụtara ma nyefee ọha na eze n'akwụkwọ (5). Ọ na-adabere na nri na-enye ụfọdụ salts ịnweta n'ụzọ ziri ezi na-adabere na mmekọahụ chọrọ. A nri ọgaranya calcium na magnesium ga-agbanwe ikpu pH nke nwanyị, nke ga-egbochi penetration nke Y spermatozoa n'ime akwa, ya mere kwere ka inwe nwa nwaanyị. N'aka nke ọzọ, nri bara ụba na sodium na potassium ga-egbochi ntinye nke X sperm, na-eme ka ohere nke ịmụ nwa. A ghaghị ịmalite nri a siri ike ma ọ dịkarịa ala ọnwa 2 na ọkara tupu atụrụ ime. Onye edemede ahụ webatara ọnụego ihe ịga nke ọma nke 87%, ọ bụghị nke sayensị kwadoro.

Nnyocha (6) mere n'etiti 2001 na 2006 na ụmụ nwanyị 173 mụrụ irè nke nri ion ion yana nhazi oge nke inwe mmekọahụ dịka ụbọchị nke ovulation si dị. Ejiri ya nke ọma ma jikọta ya, ụzọ abụọ ahụ nwere ihe ịga nke ọma 81%, ma e jiri ya tụnyere naanị 24% ma ọ bụrụ na emeghị otu ma ọ bụ abụọ ụzọ nke ọma.