Single aneuploidy was the most common type in both D3 and D5/6 embryos
a prevalence of single monosomy over single trisomy (n = 408, P < 0.0001, binomial test) in cleavage embryos
the parental origin of aneuploidy was mainly maternal, demonstrating at least a 2-fold increase in the number of affected maternal chromosomes in both monosomies and trisomies