parenting four children
Posted August 23, 2007
By admin
genotypes of parents and children?
Two parents have four children. PHENOTYPES of the children are: 1 has type A blood, 1 has type B blood,1 has type AB blood,1 has type O blood. What are the genotypes of the parents? What are the genotypes of the children?
The only way to get these children is if the parental genotypes are AO and BO (or IAi and IBi, depending on the system of notation you are using.)
Figure this out from the offspring. With a child who is Type O, having alleles OO, each parent must have an O.
With a child who is Type AB, one parent must have an A and one parent must have a B.
Try the cross.
Parents: AO x BO
Gametes: A, O and B, O
Punnett square: Put A, O on the side and B, O on the top.
First row of boxes in the square: AB and AO
Second row of boxes in the square: OB and OO
These four boxes of the square are the genotypes of the children.
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