Trisomy X (Triple XXX Syndrome)
In this variation, a person is born with 47XXX chromosomes instead of the typical 46XX. If the additional X chromosome comes from the parents’ original sperm or egg cell, all of their cells will have 47XXX chromosomes. If the additional chromosome appears early during the embryo’s development, only some cells will have 47XXX chromosomes, resulting […]
Turner syndrome (X)
Turner syndrome is a chromosomal condition that affects development. Females typically have two X chromosomes, but in individuals with Turner syndrome, one copy of the X chromosome is missing or altered. The most common feature of Turner syndrome is short stature, which becomes evident by about age 5. Reduced functioning of the ovaries, the female […]
XXYY Syndrome
In this variation, someone is born with an extra copy of both an X and Y chromosome, resulting in a 48XXYY chromosome pattern instead of the typical 46XY. People with XXYY chromosomes may often have undescended testes and produce lower-than-typical amounts of testosterone, which can cause them to start puberty later than typical and to […]