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Hiroshima Journal of Medical Sciences Volume 34 Issue 2
published_at 1985-06
A Case of 48, XYY, +21
TERAMOTO Hideki
NOMURA Kazushi
TANAKA Shin-ichiro
SUNAHORI Koji
OHAMA Koso
Abstract
A 3 month-old boy with a karyotype of 48, XYY, + 21 is reported. The patient had the typical features of Down syndrome and normal male genitalia.
Analysis of Q- and R-banded chromosome heteromorphisms of the patient and the parents showed that two of the three chromosomes 21 in the patient originated as a result of failure of the paternal second meiotic division. Therefore both additional chromosomes in the patient resulted from nondisjunction at paternal meiosis II.
Analysis of Q- and R-banded chromosome heteromorphisms of the patient and the parents showed that two of the three chromosomes 21 in the patient originated as a result of failure of the paternal second meiotic division. Therefore both additional chromosomes in the patient resulted from nondisjunction at paternal meiosis II.
About This Article
Keywords
48
XYY
+21
Parental origin
Other Article
PP. 165 - 171
PP. 189 - 199
PP. 201 - 207
PP. 253 - 256