Given: IV-3 has condition B but not condition A
• Condition A: autosomal recessive (aa = affected)
• Condition B: X-linked recessive (XbXb or XbY = affected)
Adjusting probabilities based on new information
Individual IV-3 is born as a male affected with condition B but not condition A. His parents are bred again, and an ultrasound shows that the fetus is another male. The relevant portion of the pedigree is shown below. Use this new information to determine the parents.
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