Differences in the self-concept of male and female monozygotic twins were compared as measured by the Tennessee Sea-Concept Scale. Forty sets of monozygotic twins (20 male, 20 female) were randomly selected for the study. Their responses were scored and the Student t test was computed
for each of 11 categories of self-concept to assess differences in female and male scores. The results indicated that female monozygotic twins were more satisfied with their "total" self- concepts including the self-concept categories of identity, behavior, moral-ethical, personal, family
and number of deviant scores, when compared with male monozygotic twins.