Determine the genotype of the parents in the following cross…

Determine the genotype of the parents in the following crosses.  Use correct symbols and show your work. a)    One parent is group A blood type, the other group B, but all 4 groups are represented in their children. b)    A normal colour vision female marries a normal colour vision male.  Their first son is colour blind.  Colour-blindness is a sex-linked disorder. c)    A brown-eyed, right-handed male marries a blue-eyed, right-handed woman (brown eyes and right-handedness are dominant).  Their first child is blue-eyed and left handed.