Based on this information, what is this plant's phenotype for the seed color trait?

 - light brown seeds
 - dark brown seeds
The bitter melon plant's genotype for the seed color gene is dd. The bitter melon plant's genotype of dd has only d alleles. The d allele is for light brown seeds. So, the bitter melon plant's phenotype for the seed color trait must be light brown seeds.
To check this answer, consider whether the bitter melon plant's alleles are dominant or recessive. The allele for dark brown seeds (D) is dominant over the allele for light brown seeds (d). This means D is a dominant allele, and d is a recessive allele.
The bitter melon plant's genotype of dd has only recessive alleles. An organism with only recessive alleles for a gene will have the recessive allele's version of the trait. So, the bitter melon plant's phenotype for the seed color trait must be light brown seeds.