Both parents in this investigation were Tt for all traits. How would the results have differed if both parents were TT? Or what if both parents were tt? Explain.

If both parents were TT there would be no way for the parents to give out a recessive trait to their offspring because neither carry it. If both parents were tt there would be no way the parents could give out a dominant trait to their offspring because neither carry it. Because the parents are both Tt in this investigation there's an equal chance that they could give their offspring a recessive OR dominant trait.