10. Identical twins come from a single egg that split into two embryos, and frat

Question

10. Identical twins come from a single egg that split into two embryos, and fraternal twins are from separate fertilized eggs. Also indentical twins must be of the same sex and the below to complete parts (a) and (b) below. Sexes of Twins boy boy boy/girl girl boy girl/girl Identical Twins Fraternal Twins 10 10 10 10 (a) After having a sonogram, a pregnant woman learns that she will have twins. What is the probability that she will have identical twins? (b) After studying the sonogram more closely, the physician tells the pregnant wom that she will give birth to twin boys. What is the probability that she will have identical twin consist of two boys. s? That is find the probability of identical twins given that the twins

Explanation / Answer

a) P(identical twins) = (1+1)/(1+1+10+10+10+10)

= 2/42

= 0.0476

b) P(identical twins | two boys) = P(identical twins and boys)/P(two boys)

= 1/(10+1)

= 0.0.0909

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