Genetic and Environmental Architecture of Twins Cognition
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Date
2019
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CCSHAU
Abstract
Genetic and environmental influences on cognition of twins from two districts of state
Haryana were assessed. A sample of 100 pairs of twins in the age groups of 6-8 years was chosen from
selected locations. Cognition of twins was assessed with help of Wechsler Intelligence Scale for
Children WISC-R (Wechsler, 1974) whereas home environment was assessed by using the Home
Observation for Measurement of the Environment (HOME) Inventory (Bradley et al. 1988). Regarding
personal profile of the respondents, the results revealed that most of the twins were boys having one
sibling and second ordinal position. Majority of the twins were living in nuclear family with medium
size family structure. With regard to parental education, highest percentage of twins were having their
fathers educated 11th and above level but were farmers, where as mothers were educated upto
matriculation that was the reason they were homemakers. Result on the twins indicated that all the
aspects of cognitive abilities, namely, similarities, digit span, arithmetic, object assembly,
comprehension and picture arrangement were found to make significant difference in cognition of
twins on the basis of standard test. The heritability estimates shown a great role of genes in framing the
overall cognitive abilities of twins. The significant associations of cognitive abilities were found with
the variables namely; caste, mother education and occupation in Hisar district. Home environment was
also influential factor for development of cognitive abilities in twins of both districts.
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