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Double Y syndrome

Authoring team

This is an example of sex chromosome anomaly.

The genotype of affected individuals is 47, XYY.

There is an incidence of about 1 in 800 male births.

Clinical features of individuals with this genotype include:

  • males are tall, fertile
  • it was hypothesised that males with this genotype had minor mental and psychiatric illness, and that there was a higher than average incidence of this genotype in tall criminals. These hypotheses are now being disputed

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