A population of aliens ten with green skin and ten with blue skin, are flying around in the atmosphere of their home planet. While flying around, the door of the spacecraft suddenly flies open. Eight of the aliens with
blue skin fly out of the spacecraft and are lost forever. After a few generations, this population has no aliens
with blue skin.
What evolutionary force has influenced the allele frequency of this population?
A.) Genetic drift
B.) Gene flow
C) Mutation