Inbreeding depression and intelligence quotient among north Indian children.

This study presents the assessment of inbreeding depression on the intelligence quotient among north Indian Muslim Children of school age. The Wechsler Intelligence Scale for Children (WISC-R)-74 was given to the children in both groups (50 each non-inbred and inbred of the first-cousin status), aged 6 to 11 years and from the same socio-economic status. The change of the mean follows genetic theory; however, the nature of the change in variance seems to be somewhat different.