Oogamous is a type of sexual reproduction in which the fusing gametes are dissimilar. One of the gametes is smaller and it behaves as the male gamete. The larger non- motile gamete acts as a female gamete. The system of reproduction between the dissimilar gametes is known as the oogamy; it is a type of heterogamy. This type of reproduction is common in red algae and brown algae; it is also present in the green algae.