Answer:
Founder effect
Step-by-step explanation:
The founder effect is the effect observed on the gene pool of a population when a non-random sample of a larger population gives rise to a new form of the population in a new habitat.
Since the new population is formed or founded by the non-random individuals of the larger population, therefore, the effect is called founder effect which is observed in terms of the gene pool.
Thus, the founder effect is the correct answer.