People who are born female usually have two X chromosomes. Triple X syndrome (also called trisomy X syndrome, XXX syndrome, or 47,XXX) is a rare genetic condition where females inherit an extra X ...

During meiosis II, each haploid cell divides its ... The recurrence risk with trisomy is 1% to 2% or the maternal age risk, whichever is greater. [2] There is a recurrence risk of 5% to 10% ...

Mosaicism occurs when two or more groups of cells in a person possess a different genetic makeup. As a mosaicism example, a person might possess some cells that have 46 chromosomes while other ...