Question

this is a question from my genetics class!

D owolt blir oud mobilidade Duld S hoot 6.) If baby Jacinda comes out with AB blood, what would the genotypes of her parents have to be to produce a 1:2:1 ratio? Instead, what if it turns out that Jacinda has one brother with AA blood, another brother with AO blood and a sister with 00 blood. What were mami and papi's blood types?

Answer 1

We can find out the type of blood which is carried by Mother by observing the blood type of father and children.

Condition 1:

Jacinda has blood group “AB” means one parent carry “A” allele and another parent carries “B” allele.

To get 1:2:1 ration:

One parent is I^AI^B and another parent is I^AI^B

	IA	IB
IA	IA IA	IA IB
IB	IA IB	IB IB

THE RATION : 1:2:1

Condition 2:

“AA” Blood group of child 1 indicates that both parents have at least one “A” allele.

“AO” Blood group of child 2 indicates that one parent carry “A” allele and another parent carry “O” allele.

“OO” Blood group of child 3 indicates that both parents have at least one “O” allele.

By assembling all of the points we can predict the genotype of both parents.

Mami: I^A I^O

Papi: I^A I^O

	IA	IO
IA	IA IO	IA IO
IO	IA IO	IO IO

RATION: 3:1