A heterozygous, three-horned alien from Mercury has met and fallen in love with a four-horned alien from Jupiter. What would happen if there was an intergalactic mating between the pair?

T is for three horns

F is for Four.

For the three horned one I have Tf

What would it be for the four horned one?

Because the three-horned alien is heterozygous, we know that three must be dominant to four, because the gene for the three horns is "hiding" the gene for four horns. Therefore, the three-horned alien has the genotype Tt (T for three horns, and t for four horns). The four horned alien must be tt, because that is the only way that a recessive trait may be seen. If you solve the punnet square on a cross between Tt and tt, you end up with half three (heterozygous) and half four (homozygous recessive) it is a bit easier to explain with something a little "closer to home" if you want me to explain it again, just say so, I don't mind!