Which of the following scenarios will decrease the genetic variation of population
1. A population experiences a significant decrease in size due to a natural disaster, resulting in fewer individuals to contribute to the gene pool.
2. Selective breeding practices in agriculture or animal husbandry lead to the proliferation of certain desired traits, reducing the overall genetic diversity within the population.
3. Inbreeding occurs within a small population, leading to a decrease in heterozygosity and an increase in genetic disorders.
4. Migration of individuals from one population to another with different genetic characteristics results in dilution of the gene pool and a decrease in genetic variation within both populations.