How does the number of chromosomes in a sex cell compare with the number of chromosomes in the parent cell

Sex cells have half a set of chromosomes, 23, while parent cells have 46.

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