Answer Happy

You have been hired as a genetics expert to appear on a new
Netflix special called, “Are you my baby’s daddy!?” You are asked
your opinion on two different cases.
a) Case 1: Angela has O blood type. Her mother has B blood
type, and her father is type O. Angela’s son, Weston, also has O
blood type. Angela claims that Hans is the father of
Weston, but Hans denies the claim. Hans is type B blood, add both
his parents are type AB. In your opinion, is it possible that Hans
is Weston’s father? Why or why not?
b) Case 2: Sian is the daughter of Jen. Jen claims that Mo is
the father of Sian, but Mo is convinced that he is not the father.
Both Sian and Jen have type A blood. Sian’s maternal grandparents
(Jen’s parents) also both have A blood type. Mo has B blood type,
while his mother is type A and his father type B. In this
case, can you rule out Mo as the father of Sian? Why or why
not?