Part one of term paper
Also known as a sonogram, an ultrasound reflects sound waves off of the fetus and then is shown on a special computer screen. This test is not very clear and physical features such as limb, heart, brain, and spine abnormalities can't be seen until 16-18 weeks of pregnancy. The ultrasound mostly only detects things of structural and/or physica ...

Part two of term paper
... to identify chromosome abnormalities and certain genetic disorders as early as 10-12 weeks of pregnancy. The test is done by inserting a thin flexible tube through the woman's vagina and cervix, into the early placenta. A small sample of chorionic villi is removed and taken for laboratory testing. The chorionic villi has the same genetic makeup as the fetus because it is of fetal origin. Chorionic villus sampling will detect up to 99% of chromosome abnormalities. Some follow-up ultrasounds are recom ...