Double Y syndrome
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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