In his book Twins and Supertwins, Amram Scheinfeld explains: “Some fraternal twins may have a high degree of resemblance if they have an unusual proportion of matching hereditary factors —that is, while fraternals . . . on the average have about 50 per cent of their genes in common, some may have many fewer, and look very unalike, and some may have many more, and look sufficiently alike to be mistaken for identical twins.”
Sa kaniyang aklat na Twins and Supertwins, si Amram Scheinfeld ay nagpapaliwanag: “Ang ibang fraternal na kambal ay maaaring may mataas na antas ng pagkakahawig kung sila ay mayroong di-pangkaraniwang kasukat ng magkatugmang mga salik sa pagmamana —yaon ay, bagaman ang fraternal na kambal . . . ay mayroon sa katamtaman na halos 50 porsiyentong magkatulad na genes, ang iba ay iilan lamang, at sila’y hindi magkamukha, at ang iba ay maraming magkatulad na genes, kaya’t sila’y halos magkamukha anupa’t sila’y napagkakamalang identical na kambal.”jw2019 jw2019