Describe 3 tests for genetic disorders.

1)Antenatal testing is used to analyse an individual's DNA or chromosomes before they are born. This testing is offered to couples who may have an increased risk of producing a baby with an inherited disorder, but it can't detect all the risks of inherited disorders. 2)Neonatal testing (new born blood spot test) involves analysing a sample of blood from pricking a baby's heel. It detects genetic disorders in order to treat them early. 3)Pre-implantation genetic diagnosis (PGD) is used on embryos before implantation. Fertility drugs stimulate the release of several eggs.The eggs are collected and fertilised in a Petri dish. This is known as in vitro fertilisation (IVF). Once the embryos have reached the eight-cell stage, one cell is removed. The cells are tested for the disorder causing alleles. Embryos that don't contain the disorder allele are implanted into the uterus.