which includes the physical characteristics of an organism?\ngene\nallele\ngenotype\nphenotype

Brief Explanations:

• A gene is a segment of DNA that codes for a particular trait.
• An allele is a variant form of a gene.
• Genotype refers to the genetic makeup of an organism.
• Phenotype refers to the physical characteristics or observable traits of an organism, which is what the question is asking for.

Answer:

phenotype