Chero mwana anozvarwa kubva mukusangana: iyo yeoocyte parutivi rwaamai uye urume parutivi rwababa. Imwe neimwe inounza yavo genetic zvinhu:

• 22 machromosome + imwe X chromosome yeoocyte
• 22 machromosome + X kana Y chromosome yembeu

Kubereka kunobereka zai rinonzi zygote, sero rekutanga umo machromosome aamai neababa akabatana. Iyo genome inobva yakwana: 44 chromosomes uye 1 peya yemakromosome epabonde. Kubva pamusangano pakati pezai nembeu, maitiro ose emwana atove akatemerwa: ruvara rwemaziso ake, bvudzi rake, chimiro chemhino dzake, uye zvechokwadi, zvepabonde.

• kana urume hwaive mutakuri weX chromosome, mwana anotakura XX pair: anenge ari musikana.
• kana akatakura Y chromosome, mwana anenge aine XY pair: anenge ari mukomana.

Bonde remwana saka rinoenderana netsaona, zvichienderana nekuti ndeupi urume huchabudirira kutanga kubereka oocyte.

Kubva pavhiki rechitanhatu rekuzvitakura, masero ekutanga epabonde anoiswa munzvimbo iyo mazai kana ma testes anozokura gare gare. Asi kunyange kana yatove yakagadziriswa, panguva ino zvepabonde ye fetus inoramba isina mutsauko. Muvakomana, peni inova pachena pavhiki yegumi nemaviri yekuzvitakura (6 WA - 12rd mwedzi), uye muvasikana, chibereko chinotanga kuumbwa pavhiki yemakumi maviri yemimba (14 WA, mwedzi 3) (20). Saka ndepachipiri pamuviri ultrasound (morphological ultrasound yemavhiki makumi maviri nemaviri) kuti zvinokwanisika kuziva bonde remwana.

• nzira yeShettles

Maererano nebasa reAmerican biologist Landrum Brewer Shettles, munyori we Kusarudza Bonde Remwana Wako2 (Masarudziro emhando yemwana wako), mbeu inotakura chromosome yechikadzi (X) inofambira mberi zvishoma nezvishoma uye ichirarama kwenguva refu, ukuwo mbeu inotakura chromosome yemurume (Y) inofambira mberi nekukurumidza asi ichirarama kwenguva pfupi. Iko pfungwa saka kuronga kuita zvepabonde maererano nezvinodiwa zvepabonde: kusvika kumazuva mashanu isati yasvika ovulation kukurudzira spermatozoa inonyanya kupikisa kuitira kuti ave nemwanasikana; pazuva rekubuda uye nemazuva maviri anotevera kusimudzira urume hunokurumidza kumukomana. Kune izvi zvinowedzerwa mamwe matipi: pH yecervical mucus (alkaline ine baking soda vaginal douche yemukomana, acidic nevhiniga yekugezera kumusikana), kudzika uye axis yekupinda, kuvapo kwechikadzi orgasm kana kwete, nezvimwe. Dr. Shettles vanoshuma 5% yehuwandu hwekubudirira… hazvina kuratidzwa nesainzi. Pamusoro pezvo, nzira itsva dzekuongorora urume hadzina mutsauko muanatomy kana kumhanya kwekufamba pakati peX kana Y urume (75).

• nzira yababa

Kubva pane chidzidzo (4) chakaitwa mu80s muchipatara chePort-Royal maternity pavakadzi vane pamuviri mazana maviri, nzira iyi yakagadzirwa naDr François Papa uye yakapiwa kuvanhu vose mubhuku (200). Inobva pakudya kunopa mamwe mamineral salt muzvikamu zvakanyatsotsanangurwa zvichienderana nebonde rinodiwa. Kudya kwakapfuma mu calcium uye magnesium kwaizogadzirisa pH yemukadzi, iyo yaizovhara kupinda kweY spermatozoa muzai, uye naizvozvo kubvumira kuva nemwanasikana. Sezvineiwo, kudya kwakapfuma mu sodium ne potassium kwaizovharira kupinda kwe X sperm, zvichiwedzera mikana yekuva nemukomana. Kudya kwakasimba uku kunofanirwa kutangwa mwedzi miviri nehafu isati yabata pamuviri. Munyori anoisa pamberi pekubudirira kwe5%, kwete kusimbiswa nesainzi.

Chidzidzo (6) chakaitwa pakati pe2001 ne2006 pavakadzi ve173 vakadzidza kushanda kweiyo ionic kudya kwakasanganiswa nekurongwa kwepabonde maererano nezuva rekubuda. Yakashandiswa nemazvo uye yakabatanidzwa, nzira mbiri idzi dzaive ne81% yekubudirira, zvichienzaniswa ne24% chete kana imwe kana nzira mbiri dzisina kuteverwa nemazvo.