Question

question: an organism’s genetic composition of alleles, or ____, determines the phenotype for a trait. answer input: spelling counts but capitalization doesn’t.

Explanation:

In genetics, the term that refers to an organism's genetic composition of alleles (the set of genes or alleles it carries) which determines the phenotype (the observable trait) is "genotype". This is a fundamental concept in biology, specifically in the study of heredity and genetic traits.

Answer:

genotype