Eye color Father has brown eyes and is heterozygous (Bb). Mother has Brown eyes and is heterozygous (Bb). Check the attached doc for the punnet square; Resulting offspring; Genotype Ratio; 1 BB to 2Bb to 1 bb Phenotype Ratio; 3 Brown eyes to 1 blue Eyes Therefore; The chance of this couple having a child with blue eyes will be; = 1/4 or a 25% chance
if the parents are both heterozygous then you emidiatly have to know 75% or 25% and since both parents have brown eyes than the possibility of the child having blue eyes is 25%
