Question 31
Chromosomes, DNA and Sex LinkageThe table below is a Punnett square for sex determination in man (egg: X, X; sperm: X, Y; offspring XX, XX, XY, XY).
What is the theoretical probability that a normal male child will be born?
- A.1/2
- B.1/4
- C.1/3
- D.1
- E.2/3
Show the answer and explanation
Answer: A (1/2)
Explanation
Two of the four boxes are XY, so the chance of a boy is 2/4 = 1/2.