Genetic Problem

[Camthainese]

Can someone help me solve the following question:

 

In man, the two genotypes D/D and D/d are Rh+ and d/d is Rh-. The frequency of Rh- people in the population is about 16/100.

 

a) what proportion of the children in a series of families in which one parent is Rh+ and the other Rh- would be expected to be Rh+?

 

b) What proportion of the children from a series where both parents are Rh+ would be expected to be Rh+?

 

c) Amongst the Rh+ children from part b, what proportion are carriers?

 

I somehow got 84/625 for part a and 1-(84/625) for part b. I'm pretty sure it's totally off, so if someone can help explain this to me, I would appreciate it.

 

L