The document discusses how alleles determine eye color and hair color through dominant and recessive traits. It explains that people need two copies of the recessive blue eye allele "b" to have blue eyes, while only one copy of the dominant brown eye allele "B" is needed for brown eyes. Similarly, hair color is determined by alleles where some alleles are dominant and others recessive. The document uses Punnett squares to illustrate inheritance and predicts that ginger hair may disappear over time due to recessive alleles.

1. Alleles Bradley has two alleles for ginger hair

9. Punnet square B b b B