Final answer:
Planting seeds in groups of kin allows researchers to observe the effects of genetic variation on plant growth.
Step-by-step explanation:
The purpose of planting the seeds in groups of kin is to observe the effects of genetic variation on plant growth. By planting seeds from the same plant together, researchers can control for genetic differences and study how these variations impact the growth and development of the plants. This allows them to better understand the role of genetics in plant traits and characteristics.