It's hard to pick a starting point on where to begin in explaining our disdain for gender-reveal parties, but the name itself seems like a good one, in the fact that it's a complete misnomer. You are not revealing the gender of your baby; you are revealing the sex.
DNA Polymerase is a polymerase that synthesizes a DNA strand ... so it's used in DNA replication. RNA Polymerase is not used to form the primer-that is primases job. RNA Pol is used during transcription to synthesize the mRNA strand. EK does a decent job describing a primer.
RNA polymerase is an enzyme that produces RNA and catalyzes the initiation and elongation of RNA chains from a DNA template. RNA is created using a process known as transcription. The RNA polymerase is a key component to this process. The reaction that this enzyme catalyzes for is: (RNA)n + Ribonucleoside Triphosphate ->/<- (RNA)n+1 +PPi. RNA polymerases are relatively large. The size of RNA polymerase in a typical eukaryotic cell is roughly 500kDa.