Chapter 32-7. Regeneration and Transplantation of Hydra
Recommended post: 【Biology】 Chapter 32. Embryology
1. Regeneration and Transplantation of Hydra
1. Regeneration and Transplantation of Hydra
⑴ Hydra is a diploblastic animal.
⑵ When the head and foot are removed, the head is formed from the upper body region, and the foot is formed from the lower body region.
① Regeneration in Hydra has polarity.
② Head activator is secreted from the tip of the head (hypostome), forming a concentration gradient from head to foot, and foot activator is secreted from the tip of the foot (basal disc), forming a concentration gradient from foot to head.
⑶ In determining head formation by grafts, not only the graft itself but also the characteristics of the grafted site are important.
① Tissue from the body region forms a head when grafted to a more basal body region.
② Tissue from the body region does not form a head when grafted to a more apical body region.
○ This is due to the head inhibitor secreted from the tip of the head (hypostome).
Input: 2022.04.24 19:28