On what does the allelic frequency in a population depend

a: gene pool
b: ancestors
c: gene flow
d: genetic drift

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme

meiosis is the first to occur after the nuclei of opposite of opposite mating types fuse