# XXYY syndrome

> chromosomal variation of the aneuploidic type characterized by the presence of an extra X and Y chromosome

**Wikidata**: [Q8042649](https://www.wikidata.org/wiki/Q8042649)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/XXYY_syndrome)  
**Source**: https://4ort.xyz/entity/xxyy-syndrome


## References

1. Monarch Disease Ontology release 2018-06-29