person's genes. Some of them appear as a birth defect, while others do not

become distinct until later in life. Genetic disorders can range from those that

cause death to those that produce only mild problems, such as color blindness

or an extra pinky. Scientists have distinguished more than 9,000 genetic

disorders. Some are exceptionally rare while others are quite common.

There are three types of genetic disorders. The first one is categorized as

single-gene disorders. A second category of genetic diseases is chromosomal

disorders which involves abnormalities of chromosomes in which too much or

too little chromosome material is present. The third category would be the

Single-gene disorders result from errors within an individual gene. An

example of one would be Huntington's disease. This condition affects 1 in

10,000 and usually doesn't affect the person until they are 30 or 40 years old. A person with this disease develops uncontrolled movements and may have

problems with coordination, thinking, and judgment. A weakening of the

immunologic disorder called chronic granulomatous disease, and there is hope

and they usually are infertile because they lack normal ovaries.

build up in such large quantities that the central nervous system

short, with a thick, webbed neck. They may have mild problems with learning,

gradually stops functioning and the person dies. Symptoms usually become

genes located on the X chromosome, one of the two sex chromosomes. An

There are many different types of genetic screening. Clinical geneticists

Gene therapy will eventually cure some diseases in the future. Gene therapy alters the genetic makeup of certain cells and it was first used in 1990 to treat children with an ADA deficiency. Children with this deficiency cannot develop normally due to a poor immune system. They lack the immunity to fight off infections and typically die within the first years of life. In experiments

Some common words found in the essay are:
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Approximate Word count = 851
Approximate Pages = 3 (250 words per page double spaced)