Answer: yellow
Step-by-step explanation:
Phenotype refers to the observable physical properties of an organism. phenotype is determined by its genotype. Phenotype is a description of your ones physical characteristics.
From the question, the first locus which is a white squash (W) is dominant to colored squash (w) and the second locus yellow (Y) is dominant to green (y).
ww(that is; the coloured squash) are not dominant while y (that is the green) is also not dominant but only the Y(that is ; the YELLOW squash) is DOMINANT.
Therefore, the phenotype of the squash will be Yellow.