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Suppose that both members of a couple have Group AB blood. What is the probability that...

Suppose that both members of a couple have Group AB blood. What is the probability that a child of this couple will have Group A blood?

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Answer #1

A Punnett square is a chart that allows you to easily determine the expected percentage of different genotypes in the offspring of two parents. Using Punnet square we can calculate the blood group of expected offspring of a couple. Here we have kept A and B of one parent in above row and A and B of another parent in coulmn

Using basics of calculation in which

A+A=A

A+B=B+A=AB

B+B=B

So from above table we can conclude that there is only one chance out of 4 of baby having "A" blood group.

favorable cases =1

total number of cases =4

Hence probability of group A blood = 1/4 = 0.25 = 25%

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