text: There is a 1/2 chance that the child will have blood type A and a 1/2 chance that the child will have dark hair.  Since these are independantly assorting traits the chance that the child will have both dark hair and blood type A is 1/4 (becuase you have to use the product rule).\n\nThere is a 1/2 chance that the child will have blood type B and a 1/2 chance that the child wil have light hair.  Using the product rule again the chance that the child will have both light hair and blood type B is 1/4.