Answer:
1) bay - 0%
cream - 0%
buckskin - 100%
2) cream - 25%
bay - 25%
buckskin - 50%
3) co-dominance
Step-by-step explanation:
Ok so a run down on Punnett Squares, all you have to do is put the parent's genes on the top and right hand side and combine those two genes in the middle as I did in the picture. Now, co-dominance, this basically means that there is no dominant allele. For example, imagine a white flower (W) and a red flower (R). If these two plants were to breed, you would get a pink flower (WR). This means the red allele and the white allele are both co-dominant. It is basically a combination of both genes that result in a mixed phenotype of the two genes, aka red and white makes pink. This is also how you get an AB blood type.
I hope this helps!