A woman is a carrier of an X-linked recessive disease and her partner is unaffected. What is the probability that a son is affected?
Answer and explanation
Correct answer: C.
- Step 1: Sons receive the mother's X chromosome with equal chance for either allele. Step 2. So half of the sons are affected. **Answer: . Why not the others:** the father passes a Y chromosome to his sons.
Practise more Cell Biology, Metabolism and Genetics.
Free questions with an explanation for every one, and full timed German Abitur mock tests.
More Cell Biology, Metabolism and Genetics questions
- Which organelle is the main site of ATP production in eukaryotic cells?
- Which base pairs with adenine in DNA?
- What is the plant cell wall mainly made of?
- Where in the chloroplast do the light-dependent reactions of photosynthesis take place?
- What happens to red blood cells placed in a hypotonic solution?
- What does a competitive inhibitor do to an enzyme?