How can I identify a recessive and dominant gene? For example, I have two allelic genes. How can I identify a recessive and dominant gene? Are there any databases with this information? Or the answer to my question is to study the concept of "haplosufficiency"?
I'd probably look up the genes in OMIM, which provides detailed description of the functions and phenotypes associated with genes, including inheritance mode.

For example, this is what you would get for TP53: