Final answer:
The coefficient of relatedness (r) within a single multicellular organism is 1.0, indicating that all the cells share the same genetic material and are genetically identical to the zygote from which they derived.
Step-by-step explanation:
The coefficient of relatedness (“r”) between the cells within a single multicellular organism is 1.0. This coefficient indicates how genetically similar two individuals are. In the context of a single organism, all cells are derived from a single zygote and share the same genetic material, unless mutations occur. Therefore, the coefficient of relatedness within an organism is as high as it can be, reflecting that all the cells are clones of the zygote, barring any somatic mutations.