A man with type AB blood marries a woman with type B blood. Her mother has type O blood. List the expected phenotype and genotype frequencies of their children.

Question

jamierox4ev3r · Answer

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First of all, this table may be of use to us

vkhmn · Answer

Yes, thank you for that! The thing I don't understand is how the mom's mom's blood type affects the outcome of the mom and dad's children... how would I find that out?

jamierox4ev3r · Answer

So if the woman has a mother who's blood type was Type O, that means her genotype was ii. Then, we know that the mother here, with Type B blood, must be a Type of Carrier.

So the mother's blood type MUST be: 

$I^Bi$

jamierox4ev3r · Answer

Does this make sense?

vkhmn · Answer

Ohhhhh!

vkhmn · Answer

Yes, it does!

jamierox4ev3r · Answer

Alright! 

So if we know that the man has Blood type $I^BI^A$ and that the woman has $I^Bi$, we can set up a punnet square. 

@vkhmn any ideas on how to do this?