To answer this question we need to remember quickly how mendelian inheritance works. When an allele is dominant over other the trait that codes will be present in the phenotype whether be homozygous (GG in this case) or heterozygous (Gg in this case), for the recessive trait be shown must be two copies of the recessive trait, that is to say, must be a homozygous recessive (gg for this case), so taking this into account we can say that the genotypes that will show a yellow ground spot are GG and Gg.