John is a male with an XY for a set of sex chromosomes. The father's Y chromosome is always passed on to his sons. The chromosomes of an individual is contributed by both parents. Thus, the X chromosome could only come from his mother.
Complete the Punnet square and answer the questions below given only the following:
John's parents are Donna, a carrier for Hemophilia A, and Tony who does not have Hemophilia A.
What is the probability the John would:
A. have Hemophilia A?
B. not have Hemophilia A?
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