Name _____________________________ Date ________________ Per _____

Pedigree Analysis

1. Use A to represent the allele for Achondroplasia (a form of dwarfism). Use aa to represent a normal phenotype who exhibits the recessive trait. Use A_ where the genotype is uncertain. List the genotypes below.

2. Use a P to represent an allele for the normal enzyme that breaks down phenylalnine and pp to represent the genotype for Phenylketonuria (PKU). Where you cannot be sure whether an individual with the dominant trait is heterozygous or homozygous, show the genotype as P_. List the genotypes below.

Individual Genotype

1

2

12

3

4

123

Individual Genotype

1

2

12

3

4

123

Sex –Linked Pedigree

I

II

III

IV

The above pedigree is a family that carries the colorblindness trait. Use XC for the normal vision allele. Use Xc for the colorblind allele. Don’t forget, there are no alleles that code for colorblindness on the Y chromosome in males. List the genotypes below.

Individual Genotype

1

2

12

3

4

5

6

12

3

4

5

6

12

3

4

Questions

1. Which members of the dominant pedigree show the trait?

2. Which members of the recessive pedigree are considered carriers?

3. Which individuals passed on the color blind trait to their children?

4. If individual 4 in generation IV had a child with a colorblind man, what would the probability of that child being colorblind?