The physical appearance of an individual is known as A. HeterotypeB. GenotypeC. MorphotypeD. Phenotype

To determine the correct answer to the question regarding the physical appearance of an individual, we need to define each of the options provided:

A. Heterotype: This term is not commonly used in the context of genetics or physical appearance. It may refer to different types or forms in other biological contexts, but it is not the correct term here.

B. Genotype: This refers to the genetic makeup of an individual, specifically the alleles inherited from their parents. The genotype determines potential traits but does not directly refer to physical appearance.

C. Morphotype: This term can refer to a specific form or structure of an organism, often used in a broader biological or ecological context. However, it is not the standard term used for describing the physical appearance of an individual in genetics.

D. Phenotype: This term describes the observable physical and physiological traits of an individual, which result from the interaction of the genotype with the environment. It includes characteristics such as height, color, shape, and other visible traits.

Based on these definitions, the correct answer to the question "The physical appearance of an individual is known as" is:

D. Phenotype.