OK i am totally stumped on this question!! The ability to taste the chemical PTC

Question

OK i am totally stumped on this question!! The ability to taste the chemical PTC is an autosomal dominantphenotype, and the inability to taste is recessive. If a tasterwoman with a non taster father marries a taster man, who is aprevious marriage had a nontaster daughter, what is the probabilitythat their first child will be i) a non taster girl ii) a taster girl iii) a taster boy What is the probability that their first two children will betasters of any sex? OK i am totally stumped on this question!! The ability to taste the chemical PTC is an autosomal dominantphenotype, and the inability to taste is recessive. If a tasterwoman with a non taster father marries a taster man, who is aprevious marriage had a nontaster daughter, what is the probabilitythat their first child will be i) a non taster girl ii) a taster girl iii) a taster boy What is the probability that their first two children will betasters of any sex?

Explanation / Answer

Autosomal dominant - contains 1 dominant allele then will have theability to taste Let 'A' be the allele represents taster and 'a' be non-taster Genotype of taster woman can only be Aa (she has a non-tasterfather) Genotype of taster man can only be Aa (because she has a nontasterdaughter, meaning his genotype is heterozygous) Use a Punnett square to solve this problem:                A                   a A           AA                Aa             (taster)           (Taster) a            Aa                 aa   (taster)       (Non-taster) P(Non taster girl) = 1/4 x 1/2 = 1/8 P(Taster girl) = 3/4 x 1/2 = 3/8 P(Taster boy) = 3/4 x 1/2 = 3/8 Hope this helps!

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