Sexual reproduction involves the fusion of male and female gametes to form a new individual. Before fertilization can occur, gametes must be produced through a process called gametogenesis. This topic explains the processes of gametogenesis (spermatogenesis and oogenesis) and fertilization.
Definition
Gametogenesis is the process by which specialized sex cells, called gametes, are produced in the reproductive organs. This process involves meiosis, a type of cell division that reduces the chromosome number by half.
Fertilization is the union of a male gamete (sperm) and a female gamete (egg) to form a zygote.
Main Idea
Sexual reproduction involves the steps:
Gametogenesis — production of gametes
Fertilization — fusion of gametes
Development of zygote — growth into a new organism
The process of gametogenesis and fertilization are closely related and form the foundation of sexual reproduction. Together, they ensure the combination of genetic material from two parents, resulting in offspring with genetic diversity.
Core Concept
Types of Gametogenesis
Type
Location
Process
Product
Spermatogenesis
Testes
Meiosis
Sperm cells
Oogenesis
Ovaries
Meiosis
Egg cells
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