Question 40
Chromosomes, DNA and Sex LinkageWhich of the following is true of the children of a haemophilic man who marries a woman that is not haemophilic and does not carry the trait?
- A.All their sons will be haemophilic
- B.all their daughters will be haemophilic
- C.All their daughters will be carriers
- D.All their sons will be carriers.
Show the answer and explanation
Answer: C (All their daughters will be carriers)
Explanation
The father passes his X chromosome (carrying the gene) to every daughter, so all daughters are carriers; sons get his Y and are normal.