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Which of the following calculations require that you utilize the addition rule?

ACalculate the probability of black offspring from the cross AaBb × AaBb, when B is the symbol for black.
BCalculate the probability of children with both cystic fibrosis and polydactyly when parents are each heterozygous for both genes.
CCalculate the probability of each of four children having cystic fibrosis if the parents are both heterozygous.
DCalculate the probability of a child having either sickle-cell anemia or cystic fibrosis if parents are each heterozygous for both.
ECalculate the probability of purple flower color in a plot of 50 plants seeded from a self-fertilizing heterozygous parent plant.

Verified Answer :

JcAlmighty

The answer is D) Calculate the probability of a child having either sickle-cell anemia or cystic fibrosis if parents are each heterozygous for both. 

The addition rule is used to calculate the probability of one of the events from multiple pathways. If you want that only one of the events happens, you will use the addition rule. In a case when you want to calculate the possibility of a child having EITHER sickle-cell anemia OR cystic fibrosis, you will use THE ADDITION RULE.
For example, in statement B) you will not use this rule because there is no either/or, but both/and. In case, B) you would use the multiplication rule.

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