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.
Nearly all cases of fragile X syndrome are caused by an alteration (mutation) in the FMR1 gene where a DNA segment, known as the CGG triplet repeat, is expanded. Normally, this DNA segment is repeated from 5 to about 40 times. In people with fragile X syndrome, however, the CGG segment is repeated more than 200 times.