Identical twins come from a single egg that split into two embryos, and fraterna

Question

Identical twins come from a single egg that split into two embryos, and fraternal twins are from separate fertilized eggs. Also, identical twins must be of the same sex and the sexes are equally likely, and sexes of fraternal twins are equally likely. If a pregnant woman is told that she will give birth to fraternal twins, what is the probability that she will have one child of each sex? Use the data table below to find the probability.

Sexes of Twins

boy/boy

boy/girl

girl/boy

girl/girl

Identical Twins

1

0

0

1

Fraternal Twins

2

9

9

2

Sexes of Twins

boy/boy

boy/girl

girl/boy

girl/girl

Identical Twins

1

0

0

1

Fraternal Twins

2

9

9

2

Explanation / Answer

If a pregnant woman is told that she will give birth to fraternal twins, what is the probability that she will have one child of each sex?

Probability will be 9+9 / ( 2+9+9+2) = 0.8182

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