13
Chromosome 21 is tripled in Down syndrome.
17
Meckel Syndrome (type 1)is an autosomal recessive trait carried on chromosome 17.
if you mean chromosome its the 15th......
No age group is affected; Down syndrome is a chromosome condition that is with you at birth.
chromosome 21
The chromosomes which are affected in Turner's Syndrome is the sex chromosomes. A normal female individual has 2 X sex chromosomes. In Turner's Syndrome, a woman only has one X chromosome and is missing the other. Thus, a woman with Turner's Syndrome has the sex chromosomes X0.
Lowe syndrome is caused by a mutated gene on the X sex chromosome. Because it is X-linked, it occurs almost exclusively in males.
Rubinstein-Taybi syndrome is caused by a non-functional copy of the BREP binding protein gene (either by mutation or deletion) on chromosome 16.
Either chromosome 13 or 7. Mostly 13
Fragile X syndrome is caused by a mutation that prevents the Fragile X mental retardation (Fmr-1) gene from being transcribed. This gene is located on the X chromosome (the sex chromosome). Since males only carry one of these chromosomes, they are twice as likely to be affected by the mutation than females.
Klinefelter syndrome can result from errors in cell division of sperm or egg cells. With this syndrome, each of the cells of the person affected will have an extra X chromosome.