Is a gene that can be masked by dominant gene

An allele is the code in a gene that determines a specific trait. There are strings of alleles represented by letters that determine certain physical traits, like a code. A recessive allele is an allele that is masked by a dominant one. The only way for a recessive allele to be expressed is if there are two of the same recessive alleles that give a specific trait.

Olive oil? i don’t really have enough info for the q?