trisomy

Introduction

The state of a cell having 3 copies of a chromosome, instead of 2. For example, trisomy 21 or 3 copies of chromosome 21 instead of 2 as found in patients with Down's syndrome.

More general terms

• aneuploidy

More specific terms

• trisomy X; triple X syndrome
• trisomy-12
• trisomy-7
• trisomy-8
• trisomy-9

Additional terms

• disomy
• monsomy