Two genes determine summer squash color. The dominant W allele inhibits pigment production, resulting in white squash, while the recessive w allele allows color pigments to be produced. In ww homozygotes, the second gene determines color: the G allele produces green squash, while the g allele produces yellow squash (G is dominant over g).

A white squash plant was crossed with a yellow squash plant, producing 50% white and 50% green squash in the F₁ generation.

What are both parents' genotypes?