Template:Chromosome Aneuploidy table

Chromosome Aneuploidy

Autosomal	Sex chromosome
Trisomy 21 - Down syndrome Trisomy 18 - Edwards syndrome Trisomy 13 - Patau syndrome	Monosomy X - Turner's syndrome Trisomy X - Triple-X syndrome 47 XXY - Klinefelter syndrome 47 XYY - Jacob's syndrome

XYY syndrome is a rare chromosomal disorder caused by the presence of an extra Y chromosome. Normally, males have 46 chromosomes including one X and one Y chromosome. Males with XYY syndrome have 47 chromosomes, two of which are Y chromosomes.