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A fictional lizard population has a gene called Fire1. The dominant allele of this gene allows the lizard to produce a combustion reaction from glands in the back of their throat. A second gene, Fire2, codes for a protein that suppresses the expression of the Fire1 gene.

The lizard population is not fire-breathing, but genetic analysis reveals that a majority of the lizards have at least one copy of the dominant Fire1 allele.

Which of the following would be expected if a mutagen that targets the Fire2 gene was released into the lizard's environment?


Genetic variation will decrease as new mutations occur.


Phenotypic variation will decrease as the frequency of fire breathing lizards decrease.


Phenotypic variation will increase as some lizards will express the fire breathing trait.


Variation will not change because any mutations that occur will not affect the Fire1 gene.

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