A 21-21 tandem translocation with satellites on both long and short arms.
D002648:Child; D002869:Chromosome Aberrations; D002904:Chromosomes, Human, 21-22 and Y / Q000648:ultrastructure*; D004314:Down Syndrome / Q000235:genetics*; D005260:Female; D006801:Humans; D007621:Karyotyping; D014178:Translocation, Genetic