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First this animal starts off with having the same genes and traits with the colors yellow body and then having a white belly
Then there is a mutation within the population where the lizard is dark green and a brown belly
Over reproduction and the struggle for survival is happening because they have lots of offspring and but most die because of the predators like hawks in the desert
Because of the mutation the yellow lizard is starting to be more common which means that the females are mating with the yellow ones because it better the populations survival
Then the yellow lizard is now the dominant gene now because of the traits it gives to better the populations next generations
The dark colored lizard gene is now completely gone the only color there is now the yellow belly lizard because all the females stopped mating with the dark ones
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