A pea plant that is heterozygous for the flower color gene makes gametes. What is the probability that a specific gamete contains the recessive allele for flower color?

The specific gamete containing the recessive allele for flower color would be represented by the genotype "pp". Since the pea plant is heterozygous (Pp) for the flower color gene, it possesses the dominant allele "P". Therefore, the probability of producing a gamete with the recessive allele "p" is 50 percent.

Therefore, the correct answer is:
d. 50 percent