Klinefelter Syndrome: Meaning, Symptoms, and XXY Pattern
Klinefelter syndrome is a sex chromosome variation, usually involving an XXY pattern, that may affect testosterone, puberty, fertility, and development.
Turner Syndrome: Meaning, Symptoms, and Chromosome Pattern
Turner syndrome is a sex chromosome variation involving a missing, incomplete, or altered second sex chromosome in some or all cells.
Sex Chromosome Variation: Meaning, Types, and Examples
A sex chromosome variation is a natural difference in the number, structure, or arrangement of X or Y chromosomes, such as X, XXX, XXY, or XYY.