Trisomy 21: Origin of Non-disjunction

Overview

Journal Hum Genet

Specialty Genetics

Date 1982 Jan 1

PMID 6219937

Citations 11

Authors

J Del Mazo

A Perez Castillo

J A Abrisqueta

Affiliations

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Abstract

The Q-band heteromorphisms of chromosome 21 were used in a sample of 48 families with a Down's syndrome child to evaluate the origin of non-disjunction. The parental origin and the meiotic error were determined in 27 families, and in eight families only partial information was obtained. Paternal and maternal origin of non-disjunction was in a 1:3 ratio. Failures were five times more frequent in first than in second meiotic division in both sexes. The mean parental age and environmental factors in relation to the origin of the anomaly are discussed. Our results are compared with those obtained previously in similar studies by other authors.

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