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

Question

Identical twins come from a single egg that split into two embryos, and fratermal 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 girlgirl boy boy boy/girl girl/boy Identical Twins Fraternal Twins The probability is (Type an integer or a simplified fraction

Explanation / Answer

Following is the completed table:

Out of 28 Fraternal twins, 4+4=8 has different sex so

P(each of different sex|Fraternal twins) = 8 /28 = 2/7

Sexes of twins boy/boy boy/girl girl/boy girl/girl Total Indentical twins 2 0 0 2 4 Fraternal twins 10 4 4 10 28 Total 12 4 4 12 32

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