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  • 1.
    Larsson, Mats
    et al.
    Örebro University, Department of Behavioural, Social and Legal Sciences.
    Pedersen, Nancy L.
    Stattin, Håkan
    Örebro University, Department of Behavioural, Social and Legal Sciences.
    Importance of genetic effects for characteristics of the human iris2003In: Twin research, ISSN 1369-0523, E-ISSN 2053-6003, Vol. 6, no 3, p. 192-200Article in journal (Refereed)
    Abstract [en]

    The relative importance of genetic influences (heritability) on five general textural quality characteristics of the human iris was assessed using sex and age limitation models. Colour photographs of irises were available from 100 monozygotic twin pairs, 99 dizygotic twin pairs, and 99 unrelated randomly paired age-matched German subjects. Comparative scales were constructed and two judges who were blind to zygosity independently rated five characteristic of the subjects' left iris. Inter-rater reliabilities were larger than .90 for all five scales. The heritabilities for the five iris characteristics ranged from .51-.90. No sex-specific genetic factors were found for the iris characteristics. Age-group differences in heritability were found for one of the five iris characteristics — "distinction of white dot rings". Heritability was greater for the older cohort (90%) than the younger (73%). The iris characteristics that showed the next highest additive-genetic effect were "contractional furrows" (78%) and "frequency of crypts" in the main stroma leaf (66%).

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