Oogamy:
- In oogamy, there are two morphologically distinct gametes: large, immobile female gametes called ova (or eggs) and small, motile male gametes called sperm.
- The ova are typically much larger than the sperm and contain a greater amount of cytoplasm and nutrients, which are essential for supporting the development of the embryo.
- The sperm, on the other hand, are smaller and more streamlined, allowing them to swim efficiently and reach the ova for fertilization.
- Oogamy is the most common form of sexual reproduction in animals and plants.
Isogamy:
- In isogamy, the gametes are similar in size and morphology and are referred to as isogametes.
- Both isogametes are motile and capable of swimming.
- Isogamy is less common compared to oogamy and is primarily found in certain groups of protists, algae, and some primitive animals.
- During isogamous reproduction, two isogametes fuse together to form a zygote, which then develops into a new individual.