For an individual of a species to be weaker than the other members of it's [sic] species, it must be genetically imperfect in some way, in other words, there is a variation in its genetic code that is not in the stronger individuals.
Not necessarily the case. Humans, for example, are not genetically superior to other apes in lots of areas including strength, ability to survive in temperature extremes, speed, climbing ability, etc.
Natural selection picks the phenotypes with the best ability to survive in their environment. What makes it possible to survive in one environment may make it hard/impossible to survive in another environment.
That's why scientists are careful to use terms like fitness rather than emotion-laded terms like weaker, superior, or more perfect.
For an individual of a species to be strong, it must be closer to genetic perfection, in other words, there is less variation in its genetic code than in the weak members.
Perhaps you should rethink this. Human variety has lead to the traits which make it easier to survive in different locations. Things like lactase tolerance, dark or light skin color, and even variation in blood type make it easier to survive on certain diets, to thrive in certain locations, and to immune to different diseases than any single phenotype could produce.
Given that the major premise of your post is wrong, can we end this early?
Edited by NoNukes, : No reason given.
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