data from 20 mexican-american and 21 white biological and adopting families in which the iq score of the adopted child was available show that ( 1 ) there was no significant selective placement of these children in adopting homes , ( 2 ) there was no significant correlation between the midparent social-education rank of the adopting parents and their adopted children 's iq , and ( 3 ) there was a strong correlation between the midparent social-education rank of the biological parents and their children 's individual intelligence ranks .
C0008059
children 's
C0027361
individual