Respuesta :
What can cause a major change within a few generations of organisms would be if a mutation occurs.
Mutation
Mutation refers to a sudden change in the DNA sequence of organisms.
Changes to the DNA sequence of organisms are passed to future generations with the phenotypic changes taking effect in the immediate generation.
Thus, a mutation that results in a new color of insect is something that can change an entire population of the insect within a few generations.
More on mutations can be found here: https://brainly.com/question/17106056