For a given trait, the two-letter representation of the alleles is referred to as the organism's:

For a given trait, the two-letter representation of the alleles is referred to as the organism's:

• A. Genotype
• B. Phenotype
• C. Trait
• D. DNA

Answer: (A)

The two-letter representation of the alleles for a trait describes the organism’s genotype. It shows which versions of a gene are present on the paired chromosomes—for example, AA, Aa, or aa—indicating homozygous dominant, heterozygous, or homozygous recessive combinations. The genotype is the genetic makeup that underlies the trait, and it can influence the observable trait (the phenotype) depending on dominance and environmental factors. The phenotype is what you can see or measure, not the specific allele pair. The term trait refers to the characteristic itself, like flower color or height. DNA is the molecule that carries genes, but the two-letter code is a shorthand for the genotype, not the entire DNA sequence.

The two-letter representation of the alleles for a trait describes the organism’s genotype. It shows which versions of a gene are present on the paired chromosomes—for example, AA, Aa, or aa—indicating homozygous dominant, heterozygous, or homozygous recessive combinations. The genotype is the genetic makeup that underlies the trait, and it can influence the observable trait (the phenotype) depending on dominance and environmental factors. The phenotype is what you can see or measure, not the specific allele pair. The term trait refers to the characteristic itself, like flower color or height. DNA is the molecule that carries genes, but the two-letter code is a shorthand for the genotype, not the entire DNA sequence.