Nooc cusub oo isku dhafan ayaa lagu aqoonsaday saynisyahannada sannadkii 2007. Waxay isticmaaleen ereyga "Twin Identification Twinning" Warbixin lagu daabacay wargeyska 'Genetics Human Rights' ee 2007. Daraasaddu waxay ku saleysnayd laba labbo oo aan la garanaynin, oo lagu qeexay meel u dhaxaysa isku midka iyo walaalaha (sidoo kale loo yaqaan monozygotic ama arrimototic ). Waxay go'aansadeen in labadii mataanuhu ay isku midka yihiin dhinaca hooyada laakiin waxay wadaagaan kalabar yaraa aabayaashood.
Labadan ilmo dhif ah ayaa la rumeeysan yahay in ay soo baxeen markii laba shimbir ay bacriminayaan ukun kali ah, oo sameysmaaya triploid, ka dibna kala qaybsan. Taa bedelkeeda, qaab isku mid ah (monozygotic) foomka mataanaha ah marka ukun bacrin ah oo kaliya lagu kala qaybiyo laba; foomka mataanaha ah ee loo yaqaan 'twinotic twins' oo ka yimid laba ukun oo kala duwan oo bacrimiyey laba shahwo oo kala duwan. Si kastaba ha noqotee, xaaladdan isku midka ah ee isku dhafan ee isku dhafan, laba shimbir ayaa bacriminaya hal ukun oo laba u kala qaybsan. Dhab ahaan, mataanaha waxay leeyihiin jinsiyada mataanaha ah, laakiin waxay wadaagaan qiyaastii 50% gen oo ah gabadhooda, sida lamaanaha mataanaha ah ama walaalaha.
Faahfaahin ku saabsan aqoonsiga mataanaha lama sheegin, marka laga reebo inay ku dhasheen dalka Mareykanka, laga yaabee bartamihii 2000. Waxay uuraysteen iyada oo aan lahayn tarbiyo iyo labadaba labadaba waxay u muuqdeen kuwo caadi ah.
Cilmi baadhayaashu waxay yiraahdeen nooca noocaan oo kale ah wuxuu ahaa mid dhif ah. Mid ka mid ah khabiir yaryar ayaa sheegay in ay aad u fiicnayn in koox kale oo lab ah oo lab ah oo isku mid ah laga heli doono.
Xaaladdan, mataano ayaa u yimid falanqeeyaha dareenka marka Twin A loo aqoonsado inuu yahay hermaphrodite dhab ah oo leh jilicsanaanta jilicsan, oo leh unugyada labka iyo dheddiga labadaba. Hermaphrodite waxaa lagu qeexay shakhsi ahaan labadaba xubnaha jidhka labka iyo dheddigba ku jira jirka. Hase yeeshee, Twin B waa anatomically lab ah.
Sababaha Nooca Tijaabada ah
Cilmi-baadhayaashu ma hubin waxa sababay nooca isku midka ah ee isku dhafan, sida farqiga isku dhejinta monosygotic weli wax yar oo qarsoodi ah. Mid ka mid ah aragti ayaa soo jeediyay in qaybta ukunta ee kala qaybsan, laakiin ka hor inta aysan kala qaybin, unug kasta ayaa la bacrimiyay by shahwo kale, dhoobo geedka ka hor inta aan si buuxda u kala tagin. Waxay u badan tahay, laba shahwo oo kala duwan ayaa ukumeeyay hal ukun ah, nooca bacriminta labajibbada, iyo in ukunta ka dibna kala qaybsamo.
Biologist Michael Golubovsky wuxuu qeexay fikradda noocan oo kale ah ee isdaba-marinta sannadkii 2002-dii. Waxa uu soo jeediyay in ereyga 'sesquizygotic' uu tilmaamayo mataanaha oo ka dhalanaya "ka qaybqaadashada laba labeen lab ah oo ku jira bacriminta laba walxood oo dumar ah," "dhexdhexaad ah oo dhexdhexaad ah" oo u dhaxeeya monozygotic iyo mataano.
Xigasho:
Golubovsky, M. "Jir-dilista qoysaska: falsafada iyo saamiga hidde / caafimaadka." Cilmi-baaris Twin: Jaantuska rasmiga ah ee Bulshada Caalamka ee Daraasaadka Labaad , Abriil 2002, Bg. 75.
Muuqaalka, VL, et al. "Xaalad hermaphroditism oo dhab ah ayaa muujinaysa qaab aan caadi ahayn ee isku dhafan" Genetics Human , April 2007, Bg. 179.
Whitfield, Yooxanaa. "Labada lamaane ee la helay ayaa la ogaaday" Dabeecadda , Abaalmarinta November 29, 2015. http://www.nature.com/news/2007/070326/full/news070326-1.html