Final answer:
Yellow peas are an example of A. a phenotype, which is the observable physical characteristic or trait of an organism. The phenotype results from the interaction of the organism's genotype and its environment.
Step-by-step explanation:
Yellow peas are an example of a phenotype. The term phenotype refers to the observable traits expressed by an organism. These traits arise from the interaction of the organism's genotype, which is the underlying genetic makeup, and the organism's environment. This is illustrated by Mendel's experiments with pea plants, where he showed that the phenotype of the F1 hybrid offspring was yellow pods, even when one parent had green pods. The presence of the yellow color despite the genetic contribution from the green-podded parent indicates the yellow seed color is a dominant trait. However, the genotype of these plants may consist of different allele combinations that are not observable simply by looking at the seed color.
The observable traits expressed by an organism are described as its phenotype. An organism's underlying genetic makeup, consisting of both physically visible and non-expressed alleles, is called its genotype. Yellow peas are an example of a phenotype because the physical characteristic of having yellow color is observable in the peas.