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.
Chromosomal abnormalities are common causes of birth defects that can affect the brain and other parts of the body. The normal fertilized egg cell contains 23 chromosomes from the mother and 23 from the father. Thus, there are normally 23 pairs of chromosomes in the fertilized egg. These include two sex chromosomes: XX for girls and XY for boys. Some chromosomal abnormalities occur when there is an extra chromosome. Here are a few examples of chromosomal abnormalities that can affect the functioning of the brain.