Alteration of Generation
Alternation of generations is a reproductive strategy observed in certain organisms, particularly among some groups of plants and algae, as well as in some animal groups such as cnidarians (e.g., jellyfish and hydroids) and certain fungi.
In Obelia, as in many other hydrozoans and certain other groups of organisms, alternation of generations refers to a reproductive strategy where the life cycle includes distinct multicellular stages, each with its mode of reproduction.
This alternation typically involves two main stages in Obelia: the polyp and medusa. The polyp is responsible for feeding and asexual reproduction by budding. The medusa stage consists of the formation of free-swimming, bell-shaped structures known as medusae. The medusae release gametes (sperm and eggs) into the water, where fertilization occurs externally, forming zygotes.
Life Cycle of Obelia – Diagram, Structure and Classification
The life cycle of Obelia shows the alteration of generation. Obelia’s common name is sea fur. It is a group of aquatic organisms. Obelia classification shows it belongs to Class Hydrozoa and Phylum Cnidaria. Obelia are diploblastic, primitive organisms with a unique life cycle in the Animal Kingdom. The Obelia life cycle alternates between two phases, each having a different structure and function. This is called the alteration of generation. In this article, we will look into the life cycle obelia – diagram, obelia classification, characteristics, and obelia structure.
Table of Content
- What is Obelia?
- Obelia Classification
- Life Cycle of Obelia
- Life Cycle of Obelia Diagram
- Alteration of Generation
- Structure of Obelia
- Obelia Characteristics