What is the term for an organism's genetic makeup?

The term for an organism's genetic makeup is "genotype." This refers to the specific combination of genes and alleles that an individual possesses, which are responsible for inherited traits. The genotype provides the underlying genetic instructions that can influence various characteristics, even though the observable traits may also be affected by environmental factors.

In contrast, phenotype refers to the physical expression or characteristics of that genotype, such as appearance or behavior. Karyotype refers to the number, shape, and size of chromosomes in an organism, which can provide information about genetic disorders or chromosomal abnormalities but does not describe the genetic makeup itself. Haploid denotes a single set of chromosomes, typically seen in gametes (sperm and eggs), and describes a state rather than the genetic composition. Thus, the correct terminology for an organism's genetic makeup is indeed genotype.