If both your mother and father have pku disease, what is true?

1. you will not have the disease because the dominant trait is expressed.

2. since pku is a recessive disease, your chances of having it are 100%.

3. since both parents are homozygous, your chances of having it are 50%.

4. there is a 75% chance that you will be a carrier of the disease, but you will not show symptoms.