Its stabilising. Since the selection pressure is against the extremes which are the normal blood and the sickle cell anaemia.
Incorrect and false
Humans have innate behaviors and these are exhibited as instinctive behaviors that acts as an impulse, drive or impetus without a rational guidance. These are survival behaviors that aid to the individual's own growth in the harsh environment.
If you compare the original DNA with the mutated DNA, the first C got “substituted” by an A after the mutation.
So the answer is (C) substitution.
The history of the domesticated sheep goes back to between 11000 and 9000 BC, and the domestication of the wild mouflon in ancient Mesopotamia. Sheep are among the first animals to have been domesticated by humans, and there is evidence of sheep farming in Iranian statuary dating to that time period.
C I think would be the best answer for this question!
