Is it possible for two individuals who do not have tay-sachs to have a child with the disorder?

How much of the body is affected by chemotherapy

Ay i hate cuz my peepee be small

Asubstitute is standing at the halfway line waiting to enter the match at the next stoppage of play the ball has gone over the touchline for throwing and referee allows for the substitution to substitute wants to take the throw-in does the substitute first have to enter the field of play before being allowed to take the throw-in