Chromosomal translocation in a mongoloid male child and his normal mother

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Abstract
The presence of a translocation 21/13-15 is related in 46 chromosomes, karyotypes of a mongoloid male child (Down's syndrome). The abnormal chromosome was transmitted by the mother of the patient. The possible deficiency of translocated chromosome 21 and the possible origin of the anomaly in the family was discussed and the presence of a markedly large Y chromosome in the karyotypes of the patient as in those of his father was also noted.