The cross above is between a normal father (top) and a carrier mother (left). What proportion of sons will be affected?
- A
0%
- B
25%
- Ccheck_circle
50%
- D
100%
Explanation
Two of four boxes are sons. Of those, one is X^C Y (normal) and one is X^c Y (affected). 1/2 = 50% of sons.