Pedigree Practice

Pedigree Practice

By Mr. Thomas

Pedigree Practice

#1

A father has blood type A and a mother has blood type AB. They have 3 children, a son with blood type A, another son with blood type AB, and a daughter with blood type B. The daughter then marries a man with blood type O and they have a daughter with type O, a son who is type B and another daughter who is type O. The daughter then marries a man with homozygous blood type A and has three children. The first two children are blood type A but the last child is blood type O. Is it possible for the third child to belong to the father?

I^A I^A or I^A i = A I^BI^B or I^B i = B I^A I^B= AB ii= O

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​https://www.youtube.com/watch?v=xfZhb6lmxjk

​ The father of a woman’s child is a man whose maternal grandmother suffered from hemophilia and whose maternal grandfather he did not know. The man’s mother suffered from hemophilia but his father did not. The couple was only together for one day when the man died tragically in a car accident. The woman’s paternal grandmother suffered from hemophilia and the woman’s father did too. Her mother did not but she had one brother who did and one brother who did not. The brother who did not went on to marry and have a son who suffered from hemophilia. The woman does not suffer from hemophilia but has found herself pregnant with her late husband’s child. What is the probability that her child will suffer from hemophilia?

​#2