What is a recessive gen

A recessive gene is the type of gene that can be masked by dominated gene.

Explanation:

In order to receive trait like blue eyes you have to get it from both of your parents. These gene has the tendency to withdraw by the dominance of the dominant genes.

The gene that can be masked by a dominant gene

Explanation:

To have a trait from a recessive gene you must only have gotten both genes from your parents, for example one may have gotten blue eyes as they got the recessive gene from both their parents.