Which of the following are example(s) of trisomy---Turner Syndrome Down's Syndrome or Klinefelter's Syndrome?

Answer 1

Trisomy means having three copies of a chromosomes. Turner's syndrome is NOT an example of trisomy. Someone with Turner's syndrome has only one X chromosome. Down's syndrome IS an example of trisomy. Someone with Down's syndrome has 3 copies of chromosome 21. Klinefelter's syndrome is a tricky one. On one hand, it would be considered trisomy because they have 3 sex chromosomes. However, they are not all the SAME sex chromosomes. Someone with Klinefelter's has 2 X chromosomes and one Y chromosome.

Answer 2

Down's Syndrome is an example of trisomy, where there is an extra copy of chromosome 21. Turner Syndrome and Klinefelter's Syndrome are not trisomies; Turner Syndrome is a monosomy of the X chromosome, and Klinefelter's Syndrome is a trisomy of the sex chromosomes (XXY).