Some genetic disorders,such as Tay-Sachs disease,are always fatal,and yet these diseases occur in the offspring of two normal parents.How is this possible?

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Disorders such as Tay-Sachs disease are typically caused by a recessive gene. This means that an individual must inherit two copies of the mutated gene (one from each parent) to develop the disorder. Even though both parents may be normal (heterozygous carriers), they can still pass on the mutated gene to their offspring. As a result, the offspring has a 25% chance of inheriting two copies of the mutated gene and developing the disorder.

Some Genetic Disorders,such as Tay-Sachs Disease,are Always Fatal,and Yet These