1. **State the problem:** Describe the genotype of an individual with alleles dd, where D is dominant for dimples and d is recessive. 2. **Genotype explanation:** The genotype consists of two alleles, one from each parent. Since both alleles are d (recessive), the genotype is homozygous recessive. 3. **Formula and rules:** Dominant alleles mask recessive alleles in heterozygous individuals. Only homozygous recessive individuals express the recessive trait. 4. **Intermediate work:** The genotype is simply dd. 5. **Conclusion:** An individual with genotype dd will not have dimples because the dominant allele D is absent. **Final answer:** The genotype dd is homozygous recessive and results in the recessive phenotype (no dimples).