Final answer:
The genotype DdEeff can form four different types of gametes when the genes are assorted independently.
Step-by-step explanation:
The genotype DdEeff can produce four different types of gametes when the genes are assorted independently. Each gene has two alleles, so there are two possible alleles for each gene. By multiplying the number of possible alleles for each gene, we get the total number of possible gametes: 2 x 2 x 2 = 8 possible genotypes. However, since each gamete can have only one allele per gene, we subtract 4 genotypes to account for duplicates, resulting in 8 - 4 = 4 different types of gametes.