The plant reproductive cycle can be summarized in 6 stages: A mature diploid sporophyte produces haploid spores through meiosis.  These haploid spores undergo mitosis and develop into a mature multicellular haploid individual called a gametophyte. The gametophyte produces male and/or female gametes (sperm and egg, respectively) through mitosis. Fertilization, or the fusion of male and female gametes, forms a diploid zygote.  The zygote undergoes mitosis, developing into a multicellular diploid sporophyte. …and the cycle begins again!