Question detail
In a genetic cross, if one parent has a dominant allele for a disorder and the other parent has two recessive alleles, what is the probability that an offspring will inherit the disorder?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Reproduction
Question
- A. 0%
- B. 25%
- C. 50%
- D. 100%
Answer
50%
Explanation
The offspring have a 50% chance of inheriting the dominant allele from the parent with the disorder, thus expressing the disorder.
Common mistake
Misunderstanding Dominant and Recessive Disorders
Students often confuse dominant and recessive disorders, thinking that dominant disorders can skip generations.
Remember that dominant disorders appear in every generation and can affect individuals even if only one parent carries the allele, while recessive disorders require both parents to pass on the allele for the disorder to appear in the offspring.
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