Given what you know about how the genetic material is expressed in eukaryotes, how do you think certain genes are expressed in certain cell types but not others (i. e. neuron genes expressed in neurons, but not in liver cells) ?

Genes are expressed depending on the cell type, this biological process is known as cell differentiation.

Explanation:

Within the nucleus, gene transcription is dependent on the interaction of promoter regions with specific transcription factors that activate gene expression. Moreover, epigenetic mechanisms such as DNA methylation or histone modifications also influence gene expression