Week2_Additional_Practice_Questions_KEY

Week2_Additional_Practice_Questions_KEY - Practice...

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Practice Questions KEY 1. a. Assume the inherited trait depicted in the pedigree below is rare and state whether the condition is dominant or recessive. Assign genotypes for all individuals using A/a designations. Recessive, I=Aa; Aa. II=A-; A-; A-; A-; aa Pedigree II I b.Is the pedigree shown below consistent with a dominant or recessive trait? Pedigree I II III Recessive c. In analyzing the above pedigree in b, would you conclude that this trait is caused by a rare or common allele? State reasons for your answer.
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Common. It has high rate of occurrence in the pedigree d. Assign allele designations using A/a for the pedigree shown in b above. I= aa; Aa; Aa; Aa II=Aa; Aa; aa; Aa; A-; A-; aa; A-; aa; A-; Aa; aa III=A-; A-; A-; aa 2. Phenylketonuria, a metabolic disease in humans, is caused by a recessive allele, K. If two heterozygous carriers of the allele marry and plan a family of five children. Key: Note mating between two heterozygotes will produce a probability (pbb) of ¾ that a particular child will be unaffected and the pbb that a particular child will be affected is ¼. Also for any child born, ½ is the pbb of being a boy and ½ pbb for being a girl. a. What is the chance that all their children will be unaffected? Multiplicative rule applies here.
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Week2_Additional_Practice_Questions_KEY - Practice...

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