AP BIOLOGY

Detailed explanation-1: -To diagnose Turner syndrome, doctors use a special blood test that looks at chromosomes, called a karyotype test (chromosomal analysis). Results that indicate TS show only one X chromosome instead of two X chromosomes, with a total of 45 chromosomes instead of the usual 46.

Detailed explanation-2: -About half of all girls with Turner syndrome have a monosomy disorder. Monosomy means that a person is missing one chromosome in the pair. Instead of 46 chromosomes, the person has only 45 chromosomes. This means a girl with TS has only one X chromosome in her 23 rd pair.

Detailed explanation-3: -Turner syndrome (also known as monosomy X) is a condition caused by monosomy . Women with Turner syndrome usually have only one copy of the X chromosome in every cell, for a total of 45 chromosomes per cell. Rarely, some cells end up with complete extra sets of chromosomes.

Detailed explanation-4: -While most people have 46 chromosomes, people with Turner syndrome usually have 45 in some or all cells. The chromosomal abnormality is often present in just some cells, in which case it is known as Turner syndrome with mosaicism. In these cases the symptoms are usually fewer, and possibly none occur at all.

Detailed explanation-5: -Normally, people are born with 23 chromosome pairs, or 46 chromosomes, in each cell-one inherited from the mother and one from the father. A numerical chromosome abnormality can cause each cell to have 45 or 47 chromosomes in each cell.