Genetic Problem

[deappri]

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.

 

1. 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+?

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

3. 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.

[Agent Smith]

On 6/8/2022 at 11:25 AM, deappri said:

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.

DD & dd OR Dd & dd

1. DD & dd: Dd or Dd or Dd or Dd (all Rh+)

OR

2. Dd & dd: Dd or Dd or dd or dd (2 Rh-)

P(Rh-): 2/8 = 1/4 = 25%

 

 

 

Edited November 30, 2022 by Agent Smith