Wani masanin kimiyya ya gano sabon nau'i na twinning a shekarar 2007. Sun yi amfani da kalmar Semi-identical Twinning a cikin wata rahoto da aka wallafa a cikin Journal of Human Genetics a 2007. Wannan binciken ya dogara ne akan wani jinsin da ba a sani ba, wanda aka kwatanta a matsayin wani wuri a tsakanin m da kuma fraternal (wanda aka fi sani da monozygotic ko dizygotic ). Sun ƙaddara cewa ma'aurata sun kasance daidai a gefen mahaifiyarta amma suna rarraba rabin rabin kwayoyin halittar mahaifinsu.
Wadannan 'yan tagwaye masu tsinkaye suna ganin sunyi girma lokacin da kwayar halitta guda biyu suka hadu da kwai guda, suna yin tafiya, wanda ya raba. Da bambanci, ma'aurata (monozygotic) suna samuwa lokacin da takalmin hadu guda ya rabu biyu; Abokan tagulla (dizygotic) sun fito ne daga ƙwai guda biyu da suka hadu da nau'i biyu. Duk da haka, a cikin wannan yanayin na yatsun kafa guda biyu, sperm guda biyu sun hadu da kwai ɗaya da ya raba cikin biyu. Genetically, ma'aurata suna da nau'o'in mahaifa guda ɗaya, amma suna raba kimanin kashi 50 cikin 100 na jikinsu na haihuwa, kamar su ma'aurata masu juna biyu ko 'yan uwan.
Bayani game da ainihin jima'i ba a bayyana ba, banda cewa an haife su ne a Amurka, mai yiwuwa a tsakiyar 2000. An haife su ba tare da taimakon haihuwa ba kuma jima biyu sun bayyana al'ada al'ada.
Masu binciken sun lura cewa irin wannan jima'i yana da wuya. Wani masanin gwadawa ya ce yana da wuya wanda zai iya gano wani jigon ma'aurata guda biyu.
A wannan yanayin, ma'auratan sun zo wurin mai bincike yayin da aka gano Twin A a matsayin hermaphrodite na gaskiya tare da lalataccen mace, yana da nau'in ovarian da kwayoyin gwaji. An bayyana hermaphrodite a matsayin mutum wanda dukkanin sifofin mata da na mace suke cikin jiki. Duk da haka, Twin B shine namiji anatomically.
Dalilin wannan nau'i na Twinning
Masu bincike ba su tabbatar da abin da ya haifar da irin wannan jima'i ba, kamar yadda twinning mai suna monozygotic ya kasance wani abu mai ban mamaki. Wata ka'ida ta nuna cewa yaduwar kwayar halitta ta raba, amma kafin a raba, kowace kwayar halitta ta hadu da kwayar halitta daban-daban, ta yada kwayoyin halitta kafin ta rabu. Ƙila wataƙila, sperm daban daban sun hadu da kwai ɗaya, nau'i na haɗuwa biyu, da kuma cewa kwai ya tsaga.
Masanin ilimin halittu Michael Golubovsky ya gano irin wannan nau'in jima'i a cikin binciken 2002. Ya nuna cewa lokacin da lakabi ne nonquizygotic zai iya kwatanta jinsin da ya haifar da "shigar da kalmomin namiji biyu a cikin haɗuwa da samfurori guda biyu na mata," wani "matsakaicin matsakaici" tsakanin ma'aurata monozygotic da dizygotic.
Source:
Golubovsky, M. "Iyalan mahaifiyar iyali: maganganu da kwayoyin halitta / likita." Binciken Twin: Labarin Jarida na Ƙungiyar Ƙasa ta Twin Studies , Afrilu 2002, pg. 75.
Souterrain, VL, et al. "Wani lamari na hermaphroditism na gaskiya ya nuna wata hanya ta banbanci na twinning." Genetics , Afrilu 2007, pg. 179.
Whitfield, John. "Ma'aurata masu juna biyu sun gano" Yanayin , Samun dama ga Nuwamba 29, 2015. http://www.nature.com/news/2007/070326/full/news070326-1.html