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In human reproduction , a new individual is formed when two cells, or gametes, come together: an ovum (egg) from the female and a sperm from the male. This union creates a zygote, with each gamete contributing half of the genetic material half from the mother and half from the father. Obesity is a global health concern with major implications for male reproductive function. It disrupts endocrine and metabolic homeostasis, impairs semen quality, and is associated with reduced pregnancy and live birth rates. This article provides detailed insights into the process of human reproduction , its types and significance. It also details the stages involved in the reproduction process in humans , from pre-fertilization to post-fertilization. The reproductive events in humans include formation of gametes (gametogenesis), i.e., sperms in males and ovum in females, transfer of sperms into the female genital tract (insemination) and fusion of male and female gametes (fertilisation) leading to formation of zygote.
