Objective: A cytogenetic survey of the mentally retarded children in Seoul City Welfare Center for the Mentally Retarded and St Peter school has been undertaken. Methods: The chromosome analysis was carried out in 92 males and in 66 females as a tota...
Objective: A cytogenetic survey of the mentally retarded children in Seoul City Welfare Center for the Mentally Retarded and St Peter school has been undertaken. Methods: The chromosome analysis was carried out in 92 males and in 66 females as a total of 158 cases. Results: Abnormal karyotypes were observed in 22.2% of the total cases (35/158). Autosome and sex chromosome anomaly were observed in 20.3%(32/158) and 1.9%(3/158) respectively. Of 35 cases of anomaly, 91.4%(32/35) was autosome anomaly and 8.6%(3/35), sex chromosome anomaly. Conclusion: Down syndrome karyotype was the most frequent anomaly among autosome anomalies which was 62.5%(20/32) and other autosome anomalies were observed in 37.5%(12/32).