To my knowledge there is no way to tell asphalt or yellowbelly apart. So you could see either one influencing what you are seeing. The only way to be definitive if it is an asphalt or yellowbelly is breeding him and proving him out
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I do know this, my proven asphalt male doesn't have those lip or chin markings and none of my yellow belly's have it either so was wondering if anything else could be going on with him or if it could just be unique to him with the asphalt or yb gene .