0% probability

You: ‘Based on what we learned there is 0% chance that this will occur.

Dr. Foster: ‘Actually, that selection doesn’t fit our scenario. If one parent has the disease (aa), you can’t have a zero percent chance of passing it on unless the other parent has no recessive allele at all (AA). Since this setup involves a carrier and an affected individual, there must be some possibility of transmission. Let’s head back and re-examine the other probabilities to find the correct answer.’

Try again!