To protect vulnerable 16 and 17 year olds, the offences of 'abuse of a position of trust' prohibits sexual contact between adults and children under 18 in schools, colleges and residential care.
Chromosome abnormalities usually happen as a result of an error in cell division. Meiosis is the name used to describe the cell division that the egg and sperm undergo when they are developing. Normally, meiosis causes a halving of chromosome material, so that each parent gives 23 chromosomes to a pregnancy.
Cell division is a form of reproduction, but each resulting cell in normal cell division is identical to the original. Normal cell division is called mitosis, and this results in two identical cells. These cells continue life and perform the same functions as the original cell. They grow and eventually undergo division themselves. This is the type of division for most cells. The other type of cell division is called meiosis, and it is how the body produces eggs or sperm. The process is the same for both males and females.