Teloblastic growth

Definition

Teloblastic growth is a mode of segmental development in which new segments are added sequentially from a growth zone. This process is commonly observed in annelids and some molluscs during their embryonic development.

5 Must Know Facts For Your Next Test

1. Teloblastic growth involves the addition of segments from a posterior growth zone called the teloblast.
2. This type of growth is characteristic of annelids, such as earthworms, and some molluscs.
3. The cells in the teloblast divide asymmetrically to produce smaller daughter cells that form new segments.
4. Teloblastic growth allows for continuous elongation of the organism's body during development.
5. It plays a crucial role in the regenerative abilities of certain segmented organisms.

Review Questions

• What is the primary function of the teloblast in teloblastic growth?
• Which groups of organisms commonly exhibit teloblastic growth?
• How do teloblast cells contribute to segment formation during development?

Related terms

Segmented Body Plan: A body structure characterized by repeated units or segments along its length, seen in organisms like annelids and arthropods

Posterior Growth Zone: The region at the rear end of an organism where new segments are added during teloblastic growth

Regeneration: The process by which organisms replace lost or damaged tissues; often facilitated by mechanisms like teloblastic growth