Tay-Sachs disease is inherited as an autosomal recessive. It is a devastating neurological disease that results from the lack of a normal enzyme, hexosaminidase A, whose job is to metabolize lipids (gangliosides) that are found in brain cells. A young couple is told that they are carriers for this disease. Explain, as you would to this couple, their likelihood of having a child with Tay-Sachs disease. Show the Punnett square that illustrates their chances.