What is the probability that mary and justin will have an affected child? express your answer as a fraction (example 3/5)?

suppose mary and justin have a single child.

so possible outcomes are = {b ,g, a.b, a.g} where b ⇒boy,g⇒girl,a.b⇒affected boy ,a.g⇒affected girl=4

total favorable outcome= [a.b, a.g]= 2

probability of an event= total favorable outcome÷total possible outcome

                                      =2÷4

                                    =1/2

so probability that mary and justin will have an affected child=1/2

5

step-by-step explanation: