Practice: Dihybrid Crosses
Complete a dihybrid Punnett square for each of the following scenarios. Be sure to clearly list the genotypes of
the parents, the phenotypic ratio, and answer any additional questions that are asked.
Problem A
Tall sunflowers are dominant to short, while yellow colored flowers are dominant to orange. Cross a plant that
is heterozygous for both traits with a plant that is homozygous dominant for height but heterozygous for flower
color.
Parent Genotypes: HhCc x HHCc
Phenotypic Ratio: 12:4
1. A farmer knows that most people prefer tall and yellow
flowers. If he plans to grow 100 sunflowers from these
two parents, how many can be expected to be tall and
yellow like he desires?
2. What should be the genotypes of the parent flowers (P generation) if he wants to ensure that all of the
flowers in the F1 generation are tall and yellow? HHCC