T G A C T T T C C C C G G A A A A A C T G A A A G G G G C C T T T T

To help remember the base pairings, think of the phone company, AT&T

X Y

X Y

Gene for Eye Color Gene for Hair Color piece of DNA

pair of chromosomes X Y Gene for Eye Color Gene for Eye Color

Mother’s Gene for Eye Color Father’s Gene for Eye Color

Allele for brown eyes Allele for blue eyes

X Y

B rown Eye Color

b lue B rown b lue

Brown Eye Color? Blue Eye Color?

Phenotype [Mendelian Inheritance] The Dominant allele is the Capital Letter (“B”) The Recessive allele is the Lowercase Letter (“b”)

B b Brown Eye Color Phenotype B B Brown Eye Color Phenotype

B b Brown Eye Color Phenotype B B Brown Eye Color Phenotype

Phenotype is Brown Eye Color B b Brown Eye Color is the Dominant Allele

Phenotype is Brown Eye Color B Brown Eye Color is the Dominant Allele

b b Blue Eye Color Phenotype

Phenotype is Blue Eye Color b bb b Two Recessive Alleles For Blue Eye Color