Q1: If someone in a species gets infected with an endogenous retrovirus, does that mean that absolutely all of their children will have that endogenous retrovirus? Or is it based on chance?
Q2: is there such a thing as an allele for the virus being there, and for it not being there? How does it work?
Q3: how can an endogenous retrovirus disappear from a species? And when it cannot disappear?