What percentage of their children would have brown hair if one parent had a dominant trait (brown hair), and the other parent had a recessive trait (blonde hair), and both had pure genotypes?

The correct answer to this question is 100%. The question includes a blank Punnett square, in which the student can fill in to get the correct answer. Punnett squares are square diagrams, which are used to predict a genotype. Named after Reginald C.

Punnett, these diagrams are used by biologists to determine whether a child would have a trait from their parents based on a genotype. On each square, beside the label Mother's Genes and Father's Gene's, it can be labeled BB and BB. Inside the squares, the following labels can fill them in: bb | Bb Bb | bb | Bb Bb | |