How to figure out your genotype from your family tree How to figure out your genotype from your family tree... Do a pedigree chart You need to create a family tree and label each box as to who it is. See diagram below. Females = Males = Grandmom Grandpop Mom Dad Sister/you Brother Sister Brother/you

Next, put in the alleles that are known. If the person shows the dominant trait, then put the dominant allele in the first spot. If the person shows the recessive trait, then put the recessive allele in both slots. Grandmom Grandpop Mom Dad Sister/you Brother Sister Brother/you _ _

Let's use eye color. B=brown b=blue Known phenotypes: Mom = brown Grandmom (mom)= blue Grandpop (mom)= brown Dad = blue Grandmom (dad) = brown Grandpop (dad) = blue Me = Brown Sister = blue Put the letters where they belong Grandmom Grandpop Mom Dad Sister/you Brother Sister Brother/you _ _ B b

Let's use eye color. B=brown b=blue Known phenotypes: Mom = brown Grandmom (mom)= blue Grandpop (mom)= brown Dad = blue Grandmom (dad) = brown Grandpop (dad) = blue Me = Brown Sister = blue Put the letters where they belong Grandmom Grandpop Mom Dad Sister/you Brother Sister Brother/you _ _ B b This is what you know without using relationships to others. Now fill in the letters due to relationships.

Mom = brown Grandmom (mom)= blue Grandpop (mom)= brown Known phenotypes: Mom = brown Grandmom (mom)= blue Grandpop (mom)= brown Dad = blue Grandmom (dad) = brown Grandpop (dad) = blue Me = Brown Sister = blue Relationships: Grandpop (Mom) has brown eyes but no way to tell what the second allele may be. Grandmom (dad) has brown eyes but a blue eyed child. Second allele must be blue. Mom has brown eyes with a blue eyed parent as well as a blue eyed child. Second allele must be blue. I have brown eyes with a blue eyed parent. Second allele must be blue. B B b ? Grandmom Grandpop Mom Dad Sister/you Brother Sister Brother/you _ _ B b ? b b b