Prairie. Prairies are ecosystems considered part of the temperate grasslands, savannas, and shrublands biome by ecologists, based on similar temperate climates, moderate rainfall, and a composition of grasses, herbs, and shrubs, rather than trees, as the dominant vegetation type.
Triple X Syndrome (47,XXX) Triple X Syndrome is a genetic disorder that alters the sex chromosomes. The X chromosome, along with the Y chromosome, determine the sex of an individual. Most males have only one X chromosome and one Y chromosome, while most females have two X chromosomes.
Fragile X syndrome, the most common heritable form of mental retardation in males, affects ~1/4000 males. It occurs in most ethnic and racial populations, but incidence may vary from group to group. Fragile X syndrome is an X-linked genetic disorder caused by a mutation in the FMR1 gene. Female carriers may pass it on to their children.