The terms genotype and phenotype are used to describe the genetic makeup and physical appearance of an individual. Here's a brief explanation of each:

1. Genotype: The genotype refers to the genetic makeup of an individual or the specific combination of genes that an individual inherits from their parents. The genotype can determine various characteristics such as eye color, hair type, and susceptibility to certain diseases. The genotype is represented by the alleles of the genes that an individual has, which can be either dominant or recessive.
2. Phenotype: The phenotype refers to the physical and observable traits or characteristics of an individual, which are determined by both their genotype and environmental factors. The phenotype includes traits such as height, weight, eye color, hair color, and behavior. The phenotype is the result of the expression of the genes, and it can be influenced by various factors such as nutrition, exercise, and exposure to environmental factors.

In summary, the genotype refers to an individual's genetic makeup, while the phenotype refers to their observable physical traits. The genotype determines the potential for certain traits to be expressed, while the phenotype is the actual expression of those traits, which can be influenced by environmental factors.