Anisogamy

Anisogamy is the form of sexual reproduction that involves the union or fusion of two gametes, which differ in size and/or form. The smaller gamete is male, a sperm cell, whereas the larger gamete is female, typically an egg cell. Anisogamy is common and widespread in multicellular organisms. It is thought to have evolved from isogamy. Since the biological definition of male and female is based by gamete size the evolution of anisogamy is viewed as the evolutionary origin of male and female.

Anisogamy

Anisogamy is the form of sexual reproduction that involves the union or fusion of two gametes, which differ in size and/or form. The smaller gamete is male, a sperm cell, whereas the larger gamete is female, typically an egg cell. Anisogamy is common and widespread in multicellular organisms. It is thought to have evolved from isogamy. Since the biological definition of male and female is based by gamete size the evolution of anisogamy is viewed as the evolutionary origin of male and female.