Jacob's syndrome
From Embryology
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.
902599592 LD52.1 Male with double or multiple Y
A condition affecting males, caused by the presence of supernumerary Y chromosomes. This condition is asymptomatic. Confirmation is through observation of supernumerary Y chromosomes by karyotyping.
