A population of lizards carry a gene for scale color in which the dominant allele produces green scales while the recessive allele codes for brown scales. In the first generation, you determine that 75% of the population is green and 25% of the population is brown. In the second generation, you determine that 50% of the population is green and 50% of the population is brown. Finally, in the third generation, you determine that 25% of the population is green and 75% of the population is brown. Which of the following correctly explains this change in the genotype frequencies?(1 point) The lizards mate randomly with each other.

The brown color is an adaptation that is being selected by the environment.

The lizards remain isolated from other lizards, only mating with lizards in their own population.

The DNA of these lizards carries no mutations from one generation to the next.