Apopulation of red squirrelfish breeds and produce offspring, 75% are still red but 25% are yellow. this variation in the color of the squirrelfish can be explained by a) the presence of a mutagen in the environment that caused a color change. b) the rapid disappearance of the allele for red color in the fish population. eliminate c) the presence of a recessive allele for yellow color that was masked by a dominant red color allele. d) the presence of an inhibitor protein that did not allow the allele for yellow color to produce visible results.