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  A man and a woman who are both carriers of cystic fibrosis have had three...


 

A man and a woman who are both carriers of cystic fibrosis have had three children without cystic fibrosis. If the couple has a fourth child, what is the probability that the child will have the disorder?

Question 4 options:

a) 

1/4

b) 

1/5

c) 

1/8

d) 

2/4

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Answer #1

Hi Answer:

Q. A man and a woman who are both carriers of cystic fibrosis have had three children without cystic fibrosis. If the couple has a fourth child, what is the probability that the child will have the disorder?

Answer: Option A (1/4 i.e 25%)

Explanation: Both parents are the carrier of the disease means they are heterozygous for the disease. There are ¼ chances that their child will inherit the disease. In the present case, both parents are the carrier of the disease they don’t have actually the disease. The full chances (100%) chances for disease in a child is only possible when both are homozygous for disease and when one of the parents is homozygous for disease and another is heterozygous then chances are 50%.

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