Sexual reproduction
Sexual reproduction is a type of reproduction that involves a complex life cycle in which a gamete ( such as a sperm or egg cell ) with a single set of chromosomes ( haploid ) combines with another to produce an organism composed of cells with two sets of chromosomes ( diploid ) . 
<triplet> Sexual reproduction <subj> reproduction <obj> subclass of <triplet> sperm <subj> cells <obj> subclass of <triplet> egg cell <subj> gamete <obj> subclass of