ʻO kahi hanana kakaʻikahi, superfetation, a i ʻole superfoetation, ʻo ia ka hānau ʻana o ka wahine i kona hāpai ʻana, he mau lā wale nō ke kaʻawale. Ma kahi o ʻumi wale nō nā hihia i hōʻoia ʻia ma ka honua. He mea maʻamau ka hāpai ʻana o ka superfluous i nā holoholona, ​​ʻoi aku ka nui o nā rodents e like me nā rapeti.

ʻO ka mea maʻamau, hoʻōki ka wahine i ka ovulating ke hāpai ʻo ia. ʻO ka superficiality ka ʻoiaʻiʻo o ka loaʻa ʻana o ʻelua ovulation, hoʻopaneʻe ʻia e kekahi mau lā. No laila hiki iā mākou ke ʻike i ʻelua fertilizations o nā oocytes, ʻo ia ka hopena o nā pilina ʻelua: me ka hoa like a i ʻole ʻelua kāne ʻokoʻa. 

Hoʻokomo ʻia nā fetuses ʻelua i loko o ka ʻōpū a ulu aʻe ma hope. No laila e loaʻa iā lākou nā kaumaha a me nā nui like ʻole. ʻOi aku ka maikaʻi o ka hanana ʻoiai ʻo ka hoʻololi ʻana o ka endometrium, i kapa ʻia hoʻi ʻo ka uterine lining, ʻaʻole i kūpono i ka implantation o kekahi hua manu i loko o ka ʻōpū. ʻOiaʻiʻo, i nā lā ma hope o ka hoʻoulu ʻana, e mānoanoa me ke ʻano o nā kīʻaha koko a me nā pūnaewele e hāʻawi i kahi ʻano kūpono no ke kanu ʻana.

ʻO ka hihia o ka in vitro fertilization (IVF)

Ma Palani, i ka wā IVF, hoʻokomo nā kauka i ʻelua embryos i hiki ke hoʻololi ʻia ka makahiki mai D2 a i D4 no ka laʻana. Hoʻopanee ʻia ko lākou kau ʻana i kekahi mau lā. A laila hiki iā mākou ke kamaʻilio e pili ana i ka hāpai ʻana.

I ka hapanui o nā hihia, e wehewehe ka hoʻokolohua lapaʻau piha i kēia hanana kūikawā. Ma kahi noiʻi i paʻi ʻia ma 2008 e ka Ka Nupepa o Obstetrics and Reproductive Biology *, hāʻawi ka poʻe ʻepekema i kekahi mau manaʻo: 

• ʻO kahi ʻōnaehana genetic "qualitatively a / a quantitatively hoʻoulu i ka placental production o hCG, hiki ke hoʻoulu i kahi ovulation hou a ʻae i ka implantation"; 
• ʻO ka ovulation pālua: loaʻa ia i kekahi manawa i nā wahine i ka lāʻau lapaʻau e hāpai i ka hānau ʻana; 
• ʻO ka pōʻino o ka ʻōpū: e like me kahi kōpū didelphic, i kapa ʻia hoʻi he ʻōpū pālua, no ka laʻana.

I ka hihia o ka superficiality, ʻaʻole hiki iā mākou ke kamaʻilio e pili ana i nā māhoe i hāpai ʻia i ka wā hoʻokahi. Hana ʻia nā māhoe monozygotic mai ka hua manu hoʻokahi i māhele ʻia i ʻelua i loko o nā lā 15 mua ma hope o ka hoʻoulu ʻana. Ma ka hihia o nā māhoe dizygotic, a i ʻole "māhoe fraternal", ʻike mākou i ka hele ʻana o ʻelua oocytes i hoʻomoʻa ʻia e ʻelua spermatozoa i ka wā o ka hōʻike hoʻokahi.

ʻO ka loaʻa ʻole o nā hihia a me ka kānalua o kekahi mau kauka olakino e pili ana i kēia ʻano, he mea paʻakikī ke ʻike ʻana i ka hāpai ʻana. E huikau kekahi me ka hapai māhoe dizygotic.  

ʻO ka hapa nui o ka ulu ʻana o ka intrauterine o kekahi o nā fetuses e hiki ai ke kānalua i kahi superficiality. He mea nui e hoʻoholo inā he ʻokoʻa ka ʻokoʻa o ke kiʻekiʻe ma muli o ka ʻokoʻa o ka makahiki hānau ʻana a i ʻole he maʻi ulu e hiki ke lilo i hōʻailona o kahi mea ʻino a pilikia olakino paha i ka wā e hiki mai ana. pēpē.

E like me ka hānau ʻana o ka māhoe, ʻo ka hānau ʻana o ka pēpē mua e hoʻomaka i ka hānau ʻana o ka lua. Hānau ʻia nā pēpē i ka manawa like, ʻoiai e emi iki ana kekahi o nā pēpē.