AP BIOLOGY

HEREDITY

MULTIPLE ALLELES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A couple has two children, both of whom are boys. What is the chance that the parents’ next child will be a boy?
A
0%
B
50%
C
25%
D
75%
Explanation: 

Detailed explanation-1: -The probability that both the children are boys is given as P(B) = n(B)n(S) . ) = 1. ) is the probability of A and B both happening and P(A) is the probability of A happening. Therefore, the probability that both the children are boys given that one of them is boy is 13 .

Detailed explanation-2: -Solution : The production of male or the female child is determined by the type of chromosomes present in the sperm X or Y). There is no criteria to determine the chances of male or female children. Hence, a couple will always have a 1/2 chance to have a daughter and 1/2 chance to have a son each time.

Detailed explanation-3: -It’s a matter of framing and shows how learning new information can change probabilities (just like in the Monty Hall problem). If you ask “for any family with two children, what are the chances that they have one boy and one girl” the answer is 50% (and a 25% there are two boys and 25% that there are two girls).

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