- Triosmy-21 chromosome.
- A chromosomal mutation is brought on by chromosome breaking and translocation of a fragment into the healthy chromosome.
- Standard and translocation of down syndrome.
- A third variety is referred to as mosaic and is a milder variation with some normal and abnormal cells mixed in.
- Trisomy 21 affects approximately 95% of individuals with Down syndrome.
- About 3% of those with Down syndrome have translocations, which is a very tiny rate.
- About 2% of individuals with Down syndrome have mosaic Down syndrome.
- Children with mosaic will be less impaired and disabled and have normal intellect.
- Brains are lighter than normal.
- Brainstem and cerebellum are lighter than normal.
- Cortex's smaller convolutions.
