While Goa'uld are sexless, there are some Goa'uld who can produce larva. These Goa'uld are referred to as Queens, both because they reproduce in a manner similar to Earth insects and because they often wield considerable political clout. Goa'uld Queens occasionally wield power and rise to the rank of System Lord on their own, but more often than not, they appear to serve as consorts to other System Lords (usually ones with male hosts). Almost without exception, Goa'uld queens prefer female hosts.
Queens are quite rare, and are capable of spawning numerous larval Goa'uld -- called prim'ta -- in each cycle. To do this the queen first acquires a "genetic sample" (often procured sexually, for those queens that have taken host bodies) from the symbiotes' intended host species to ensure compatibility.
While the development of new symbiotes usually involves passing on the Goa'uld genetic memory to its offspring, the queen may choose not to do so -- rendering the symbiotes "blank slates" that are more susceptible to command and domination, rather than thirsting for power and worship of their own. (SG1: "Evolution, Part 2")
Those who have passed on are denoted with a †.