An aneuploidy of the sex chromosomes in which a humanmale receives an extra Y chromosome, giving a total of 47 chromosomes instead of the usual 46; the condition is associated with learning difficulties and above-average height.
Xyy-syndrome Sentence Examples
However, since many males with XYY syndrome look like other males without XYY syndrome, they may never be identified.
There are no physical abnormalities in most males with XYY syndrome.
Males who have XYY syndrome are usually normal in length at birth but have rapid growth in childhood, typically averaging in the seventy-fifth percentile (taller than 75 percent of males their same age).
Many males with XYY syndrome are not overly muscular, particularly in the chest and shoulders.
Individuals with XYY syndrome often have difficulties with their coordination.