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Name: Period: Date: Pedigree Practice #2 Worksheet PROBLEM #1: The pedigree below shows the recessive trait for nearsightedness in Jane's family. Jane, her parents, and her brother all have normal vision. Use N for the dominant allele and n for the recessive allele. 1. How many generations are represented in this pedigree? ; CQ—-H 2. How many children did the first couple (1 & 2) have? 3 1 2 7 co 3. How many marriages are shown on this pedigree? 2a 1 jn 4, Whatis the sex and genotype of individual # 2? 3 4 . ” é ‘ Make - avn 5. What are Jane’s possible genotypes? Could be VN ain 6. What are the genotypes of individuals 5 & 6 with individual # 5 given first? Na % Na 7. Whatis the probability that individuals # 5 & 6 will have a child that is nearsighted? 5 Y ASL PROBLEM # 2: Phenylketonuria (PKU) is an inborn error of metabolism of the amino acid phenylalanine. The following pedigree shows a family affected by PKU (shaded in shapes). Use P for the dominant allele and p for the recessive allele. 4. How is PKU inherited? Explain, _» 2. Which individuals in this pedigree have PKU? SxS 3. What are the genotypes of individuals # 1 & 2? ; ee fs on 7 4, What are the genotypes of individuals # 3 & 4? @ *% Pag —Q eo » Oo PROBLEM # 3: Earlobes in humans are either attached (shaded in shapes) or detached. Answer the following questions based on the pedigree below. Use F for the dominant allele and f for the recessive allele. 4. Which trait is dominant, attached or detached earlobes? eee CleLacheet Oyo ao 2. Is this trait sex-linked or non-sex-linked? Explain. Yon - Lemme Ber \ rece ler a ) é oles Cy Hex i 5 & 7 8 9 10 3. What are the genotypes of individuals #1 & 2? 5 hl EL YX EL 1 12 4, What is the genotype of individual # 4? EL 5. What are the genotypes of individuals # 8 & 97 e & K EL 
