Mahaliccin wannan yanayin shine Jean Piaget, wanda ya lura da cewa lokacin da ake gudanar da gwaje-gwaje na musamman da yara kimanin shekarun nan suke yin kuskure guda daya, wanda ya taimakawa ra'ayin cewa ya bambanta tsarin tunani a cikin manya da yara. A halin yanzu, ilimin halayyar kwayoyin halitta yana nazarin hanyoyin tafiyar da hankali a cikin yara, hanyoyin da ake aiki da hankali, da kuma hanyoyin tafiyar da hankali na yara.
Kwafin halitta a cikin masana kimiyya
A cikin wannan yanayin ilimin halayyar tunani shine tsammanin cewa akwai wata hanyar da za ta ba ka damar canja wurin ƙwaƙwalwar ƙwayar genotype ta gado, wato, shi ne kawai nau'i na ƙwaƙwalwar ajiyar da ba za a iya rinjayar da ba za'a iya canza ba. Wannan bayanin game da jinsin da aka ba mu a lokacin haihuwar kuma an kira shi ƙwaƙwalwar ajiya. Kwayoyin jinsi na halayyar kwakwalwa da halayyar abu ne mai wuya. Bayan haka, masana kimiyya har yanzu basu iya sanin abin da ya fi tasiri a cikin samuwar mutum - zamantakewa, ilimi, abubuwan muhalli ko kowane irin nau'ikan. Shine ma'anar wannan bangare wanda shine daya daga cikin muhimman ayyuka na wannan fannin kimiyya.
Ka'idodin tsarin kwayoyin halitta shine tsammanin cewa bayanan da ke tattare da abubuwan da ke tattare da ci gaba ba kawai ba ne kawai muke tunani da tunani. An yi imanin cewa al'adun al'adu, halaye na mutum, da kuma hanyoyin ilimin da ake amfani dasu, zai iya inganta hanzarta ci gaba da rage shi.
Hanyoyin halittar kwayoyin cutar ta jiki
Irin wadannan canje-canje na faruwa ne mafi girma saboda nau'ikan abubuwan rashin haɗari na chromosomal. Mafi yawan al'amuran irin wannan nau'i ne mai laushi, da ciwon Down . Amma, a wasu lokuta, "rashin lafiya" zai iya faruwa saboda rashin cin zarafin DNA.
Har zuwa yau, kwararru ba zasu iya faɗar abin da dalilai suke haifar da irin wadannan ƙetare ba, da kuma yadda za su kauce wa hatsarin haihuwar wannan yaro. Saboda haka, nazarin waɗannan ƙetare a halin yanzu suna aiki sosai.