Question 1 What are sex chromosomes? Question 2 Which of the two sperm or egg decides the sex of the child? Question 3 Which of the two combination of sex chromosomes produces boy :XX or XY? Question 4 Which of the two combination of sex chromosomes produces girl :XX or XY? Question 5 Who is responsible for the sex of unborn baby :Father or mother. How? Question … [Read more...] about How is sex of a baby determined