Why We Donât Know The Size Of The Transgender Population. In 2001, Kerith Conron was working on LGBT issues in Bostonâs health department. She discovered that homeless transgender people were sleeping on benches because the shelters, which were segregated by gender, didnât know what to do with them.
Chromosome abnormalities usually occur when there is an error in cell division. There are two kinds of cell division, mitosis and meiosis. Mitosis results in two cells that are duplicates of the original cell. One cell with 46 chromosomes divides and becomes two cells with 46 chromosomes each.
Some chromosome abnormalities, like Down syndrome, involve very large chromosome regions. Down syndrome is the duplication of an entire chromosome 21. Therefore, all 287 genes located on chromosome 21 are duplicated in these individuals. Another example of a chromosome abnormality is 18q-.