Question 139 · LEK · Congenital hemophilias
In the case of the mother being a carrier of the mutated gene, the risk that her son will be ill with haemophilia A is:
- A. 0%.
- B. 25%.
- C. 50%.
- D. 75%.
- E. 100%.
Hint
Hemophilia A is X-linked recessive — consider which X chromosome a son can inherit from a heterozygous mother.
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