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A particular individual has red hair and is six feet tall. Are these characteristics part of his genotype or phenotype?

A Both characteristics describe his phenotype.

An organism’s genotype is its genetic makeup; its phenotype is the collection of its observable qualities and characteristics (each of which may be partly or wholly dependent on its genotype). Hair color and height both have a genetic basis, but they are not themselves genes. They are observable qualities, and are therefore part of the organism’s phenotype.