Question

Consider the genetic cross for sex in humans. XX is female and XY is male. A family has 4 children, all girls. What are the chances that the family will have a boy as their fifth child? A) 0% B) 25% C) 50% D) 100% 3)

Answer 1

They are right it’s C. 50%

I just took the test

Answer 2

The correct answer is C. 50% because XX and XY only have two options and when you do the box, your outcome or offspring is XX XY XX XY the ratio is 1:2 leaving you with 50-50