What is an analogy for transcription factors in cell signaling?

An analogy for transcription factors signaling can be a factor with a similar property can be used. For example, if 2 different tall people visited your house, then your light switch could be turned on by those people, a different transcription factor turning on a gene

mendel's first law states that during the formation of reproductive cells , pairs of hereditary factors for a specific trait separate so that offspring receive one factor from each parent.

explanation:

answer; a male inherits only one allele of the x-linked gene controlling hair color;