Tay-Sachs disease is caused by the absence of an enzyme called Hexosamindase A, which is referred to as Hex-A. The lack of this enzyme causes many metabolic problems for its host because it is necessary for breaking down wastes within the brain. The result of its absence is that it causes an increasing loss of coordination, a progressive inability to swallow, breathing difficulties, blindness, mentally retardation, paralysis, and finally death.

The enzyme known as Hex-A is extremely essential for a person to sustain life. This is due to the fact that Hex-A is needed for the body to break down a fatty waste substance found in brain cells. This fatty substance or lipid called GM2 gangliosi

The information for the body to make the Hex A enzyme is contained in a gene which is found on chromosome number 15. There are two copies of chromosome number 15 in all the body cells and therefore two copies of the gene that codes for the enzyme necessary for correct brain function. If that gene is changed or mutated, which is what happens in the case of Tay-Sachs disease, the information contained in the gene, and therefore the child, is impaired.

Tay-Sachs is an autosomal recessive trait, meaning it is manifested in an individual through hereditary. As a result the only way that a child can have the disease is if both its mother and father are carriers of the recessive trait.

Some common words found in the essay are:
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Approximate Word count = 632
Approximate Pages = 3 (250 words per page double spaced)