(1) Gametogenesis( by meiosis) -Development of male and female gametes which are haploid in nature .

(2) Fertilization- Fusion of the two gametes (haploid cells) to form zygote (diploid cell).

(3) Embryogenesis- Mitotic divisions and cell differentiation of zygote to form embryo. mitosis helps in increasing the cell number and differentiation helps to form specialized tissues and organs.

(4) Development - Growth  of embryo to form new individual.