Combining the alleles H and H gives you HH on top left
Combining the alleles H and h gives you Hh on top right
Combining the alleles h and H gives you Hh on bottom left
Combining the alleles h and h gives you hh on bottom right
Genotype ratio HH:Hh:hh=1:2:1
Phenotype ratio hairy:hairless=3:1