Define the following terms: $Genetic \ drift$ and $Gene \ migration$ $(Gene \ flow)$.

(N/A) $Genetic \ drift$ refers to the random change in allele frequencies in a population due to chance events,independent of whether the traits are useful or harmful. This often occurs when a small section of a population is isolated,migrates,or dies due to a natural calamity,leading to a shift in the genetic makeup of the remaining population.
$Gene \ migration$ $(Gene \ flow)$ occurs when individuals from one population migrate into another and interbreed with the members of the local population. This process introduces new alleles into the local gene pool of the host population,thereby altering the allele frequencies.