The social structure of the colonies was designed for the benefit of the upper class?

The gentry included wealthy planters, merchants, ministers, royal officials, and successful lawyers. Prosperous artisans, like goldsmiths, were often considered gentry as well. The gentry were few in number, but they were the most powerful people. Because members of high social classes tend to be better educated and have higher incomes, they are able to offer greater educational advantages, such as private schooling, to their children as well.

Explanation:

some women in the middle and upper classes worked as doctors, government officials, or priestesses. both women and men enjoyed a better quality of life the higher they were on the social pyramid. the egyptians believed that their class system created a stable, well-ordered society. each group had its own role to play.

genetics is the study of how dna works, the methodologies defining the new recent technologies allow scientist to have a panoramic view of the entire dna landscape, especially how genomes interact with their environment, including off course, factors outside their organisms.

thus is very possible the existence of both scenarios, where populations of isolated individuals have different genetic traits, and share traits related to genetic mutation, due rats can easily travel overseas using human transport channels. so scientists could get a vast number of data, including human interaction, evolution of rodents, health development, spread of infections, development of new organisms, how genomes evolve in different environments and so on.