A SATELLITED HUMAN Y CHROMOSOME: AN EVIDENCE OF AUTOSOME GONOSOME TRANSLOCATION A PRELIMINARY NOTE

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Abstract
A Y chromosome with satellites on the long arms was found in 100 analysed metaphases of short-term cultured blood leukocytes from a 25-year-old trisomy-21 Mongoloid male. Satellite association was found in 68 of the cells; the mean number of associations was 0.94 per cell. The association frequency for individual chromosomes was 19.5% for group D autosomes, 13.8% for group G autosomes and 21.0% for the Y gonosome. An identical Y was present in leukocyte cultures of the father, a brother, a paternal uncle and nephew, all normal individuals. A translocation between a satellited acrocentric autosome and the Y chromosome following spontaneous breakage in the meiotic cells of an untested male ancestor is postulated.