Question 2
Chromosomes, DNA and Sex LinkageIn a family of eight (8) all the children are girls. Which of the following reasons correctly explains this?
- A.The woman cannot produce male children
- B.The man has a low sperm count
- C.The Y component of the man's sex chromosome was always involved
- D.The X component of the man's sex chromosome was always involved
Show the answer and explanation
Answer: D (The X component of the man's sex chromosome was always involved)
Explanation
The mother always gives an X; a child is a girl when the father's sperm carries an X, so his X was involved every time.