How is equal genetic contribution of male and female parents ensured in the progeny ?

Explanation

Male and female parents produce male gametes (Sperms) and egg cells (Ovum) respectively through a process of meiosis. It reduces the number of chromosomes and amount of DNA to half in gametes.
Such germ cells from two individuals, i.e., male and female parents are fused to form zygote. This ensures the equal genetic contribution of male and female parents in the progeny that develop from zygote.