To solve this problem, we need to identify the factor that leads to the Founder effect in a population. Let's analyze the options:$\newline \bullet$Option 1: Natural selection - This is a process where organisms better adapted to their environment tend to survive and produce more offspring. It is not directly related to the Founder effect.$\newline \bullet$Option 2: Genetic recombination - This is the process by which genetic material is rearranged during meiosis, leading to genetic diversity. It does not cause the Founder effect.$\newline \bullet$Option 3: Mutation - This is a change in the DNA sequence, which can introduce new genetic variations. However, it is not the primary cause of the Founder effect.$\newline \bullet$Option 4: Genetic drift - This is a mechanism of evolution that involves random changes in the frequency of alleles in a population. The Founder effect is a type of genetic drift that occurs when a small group of individuals becomes isolated from a larger population, leading to a new population with different allele frequencies.$\newline$Therefore, the factor that leads to the Founder effect in a population is Genetic drift.$\newline$This corresponds to Option 4.