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.

_ boy/boy boy/girl girl/boy girl/girl

Identical_Twins 7 0 0 7

Fraternal_Twins 5 2 2 5

Explanation / Answer

P( One child of each sex/ fraternal twins) = P( Boy Girl / Fraternal Twins)+P( Girl Boy/ Fraternal Twins) = 2/(5+2+2+5) +2/(5+2+2+5) = 4/14=2/7

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.