Based on the family history, which is the most plausible inheritance pattern for this disorder, given that a girl is diagnosed with a newly discovered genetic disorder and no other... Based on the family history, which is the most plausible inheritance pattern for this disorder, given that a girl is diagnosed with a newly discovered genetic disorder and no other family members are affected?
Understand the Problem
The question describes a scenario where a girl is diagnosed with a new genetic disorder, and no other family members are affected. The question asks to identify the most plausible inheritance pattern for this disorder based on the given information.
Answer
The most plausible inheritance pattern is autosomal recessive, as it requires both parents to be carriers without showing the disease themselves.
The most plausible inheritance pattern is B. Autosomal recessive inheritance. This is because autosomal recessive disorders require two copies of the mutated gene for the disease to manifest. If the girl is the only affected individual in the family, it suggests that both parents are carriers of the mutated gene but are not affected themselves.
Answer for screen readers
The most plausible inheritance pattern is B. Autosomal recessive inheritance. This is because autosomal recessive disorders require two copies of the mutated gene for the disease to manifest. If the girl is the only affected individual in the family, it suggests that both parents are carriers of the mutated gene but are not affected themselves.
More Information
In autosomal recessive inheritance, both parents must be carriers of the mutated gene for their child to express the disorder. Since no other family members are affected, it's likely the parents are carriers, each contributing one copy of the mutated gene to the affected daughter.
Tips
A common mistake is to assume that if a genetic disorder appears for the first time in a family, it must be a dominant trait. However, recessive traits can remain hidden for generations, only appearing when two carriers have a child together.
Sources
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