Physical observable characteristics of an organism is called _______

Explanation

An organism's physical observable characteristics are referred to as its phenotype. This includes traits such as eye color, hair color, height, and other physical features that can be seen or measured. The phenotype is determined by both genetic and environmental factors. Genes provide instructions for the development of an organism's physical traits, but the expression of those genes can be influenced by environmental factors such as nutrition, temperature, and exposure to toxins. In contrast, an organism's genotype refers to its underlying genetic makeup, which includes all of its genes, whether or not they are expressed. Alleles are different versions of the same gene, while a locus is the specific location of a gene on a chromosome. Therefore, the correct answer to this question is option B, phenotype, as it refers specifically to an organism's physical observable characteristics.