Abstract
The parental origin of the extra chromosome 21 was determined with DNA polymorphisms in seven families in whom the proband and one of the parents carried an additional chromosome rearrangement (balanced translocation or pericentric inversion) not involving chromosome 21. The balanced rearrangement was inherited from the mother in two families and from the father in five families, whereas the additional chromosome 21 was derived from the mother in all seven families. These findings are not in agreement with the hypothesis of a paternal interchromosomal effect. The latter would imply that a balanced rearrangement in the father would favor nondisjunction during meiosis in the germ cells.
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Selected References
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