Explain why the offsrping with Gg genes for pod color look the same as a pea plant with GG genes for pod color

This is more a biology question but anyway ...

G = the dominant gene aka. the one that is most likely to be seen because it is stronger than g. GG and Gg will both show the dominant gene's characteristics.

g = the recessive gene. The only way this one's type can be seen in gg form with no dominant gene to overpower it