Question

an organisms genotype is (1 point)

an observable trait.

an allele that is expressed whenever it is present.

a trait that is expressed in a homozygous individual.

the set of alleles an organism has for a trait.

Explanation:

The genotype refers to the genetic makeup of an organism, which is the set of alleles it has for a particular trait. An observable trait is the phenotype. An allele that is expressed whenever present is a dominant allele. A trait expressed in a homozygous individual could be part of the phenotype or related to allele dominance - recessiveness, but not the definition of genotype.

Answer:

the set of alleles an organism has for a trait.