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Consider a dad with brown eyes and a mom with brown eyes. Brown dominant, blue recessive. 1) B B B BB BB B BB BB or 2) B B B BB BB b Bb bB or 3) B b B BB Bb b Bb bb EX1) Both parents have 2 dominant alleles. 100% chance their child has brown eyes with 2 dominant alleles. EX2) One parent has a recessive allele, but the dominant allele still makes brown eyes. 50% chance the child has brown eyes, 50% chance the child has blue eyes. EX3) Both parents have 1 recessive allele. 75% chance the kid has brown eyes, 25% chance blue eyes. If both parents have blue eyes, 0% chance the kid has brown eyes. Chances are per child. In #3, it doesn't mean 1 in 4 offspring have blue eyes and 3 in 4 have brown.
Contributed by Jessica Mallard