If a couple that are both heterozygous carriers of the cystic fibrosis allele have children, the chance that both their first and their second child are carriers is 0.5 x 0.5, or 25%, as determined by theMultiple choice question.
Question
If a couple that are both heterozygous carriers of the cystic fibrosis allele have children, the chance that both their first and their second child are carriers is 0.5 x 0.5, or 25%, as determined by theMultiple choice question.
Solution
The question seems to be incomplete, but I can explain the concept based on the information given.
Cystic fibrosis is a genetic disorder that is inherited in an autosomal recessive manner. This means that a child must inherit two copies of the defective gene (one from each parent) to develop the disease.
If both parents are heterozygous carriers, they each have one normal allele and one defective allele. The possible combinations for their children are:
- Normal allele from both parents (25% chance)
- Normal allele from one parent and defective allele from the other parent, making the child a carrier (50% chance)
- Defective allele from both parents, resulting in cystic fibrosis (25% chance)
So, the chance that one child is a carrier is 50%.
If we want to find the probability that two children are both carriers, we multiply the individual probabilities together. So, 0.5 (probability first child is a carrier) x 0.5 (probability second child is a carrier) = 0.25 or 25%.
Therefore, there is a 25% chance that both the first and second child of this couple will be carriers of the cystic fibrosis allele.
Similar Questions
If both the mother and the father are carriers for the cystic fibrosis gene, what are the chances that their child will be a cystic fibrosis carrier?
If a healthy young couple are both carriers of cystic fibrosis, the chance that their future child will have this serious illness isMultiple Choice0%.25%.75%.50%.100%.
A healthy twenty-seven-year-old female presents to the physician for genetic counseling with her husband. They would like to become pregnant in the near future, but they have concerns that their offspring may develop cystic fibrosis. The wife’s sister has cystic fibrosis, an autosomal recessive disorder with an incidence of approximately 1 in 90,000. The husband’s history is noncontributory. What is the probability of the husband being a carrier?
3. If Sophie conceives a child, and the father neither has cystic fibrosis nor is a carrier, what are the chances that the child would have cystic fibrosis?a. 0%, because the child must receive the bad gene from both parentsb. 50%, because there is a 50% chance that Sophie will pass along the bad genec. 100%, because Sophie has the conditiond. 75%, because Sophie has the condition but the father does note. 25%, because only one in four gametes will carry the bad gene
An individual who is heterozygous for cystic fibrosis ________.is a carriercannot have children with cystic fibrosishas cystic fibrosiswill have children who are all carriers of cystic fibrosis
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