An extended structure is made up of 2 types of atoms?

I think your punnett square is incorrect because it has 4 letters in one box. There must only be two letters in each box since your punnett square doesn't not contain four squares in a row or column.

Explanation:

It is perhaps Rr, Rr, Rr , and Rr again since they all start with a capital letter. The dominant allele takes over.