Atype of gene interaction in which one gene alters the phenotypic effects of another gene that is independently inherited.

Yes but sexual selection, which alters allele frequencies in the gene pool.

When a virus infects a host cell, it uses the cell's machinery to make copies of its own genetic material in a process called replication. finally, during the process of self-assembly, that protein shell and the copies of the virus's genetic material are assembled into new viruses.