which chromosome causes jacob syndrome
Jacobâs syndrome. Jacobâs Syndrome is a very rare chromosome syndrome. Male infants who are born with an extra Y male chromosome have Jacobâs syndrome. Normal males are born with an X and a Y chromosome. The extra Y chromosome is in inherited from the father. Jacobâs syndrome affects less than 200,000 people in the United States and occurs in only 1 out of every 1,000 births. Only 5 male infants a day are born with it. Other names for Jacobâs syndrome are XYY Karyotype, XYY syndrome and YY syndrome.