Breakdown of chromosomal abnormalities in spontaneous abortions: Trisomy 16 15% 13, 18,21 9% XXX,XXY,XYY 1% All others 27% Monosomy X (45,X or XO) 18% Triploidy 17% Tetraploidy 6% Other 7% Total 100%Trisomy XXX, XXY, XYY All others Monosomy X (45,X or XO) Triploidy Tetraploidy Other Total 15% 9% 1% 27% 18% 17% 6% 7% Breakdown of chromosomal abnormalities in spontaneous abortions: 100% 16 13, 18, 21