The genetic of a human is the source of a disese., but only if you have the gene type a. The relative frequency of people with carrying two copies of a is 0.0001(aa), but one copy is 0.0198(Aa). Those not having the a-gene = 0.9801(AA)  Even though you are carrying a you may not get the disese.  You can get the disese without a.  the probability of aa = 0.6, Aa= 0.02 and AA= 0.01 What is the probability that a random person has the disese?  Given you have the disese, whats the probabilty for having genes aa, Aa or AA?

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