The Early Embryos of Vertebrates Follow the Same Pathway of Development;

question 75

Short Answer

The early embryos of vertebrates follow the same pathway of development; one structure that all vertebrate embryos have in common is the ________, which serves as a primitive support structure.

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Definitions:

Instinctive Behavior

Actions or reactions that an organism is born with, such as reflexes and fixed action patterns, that are not learned.

Sign Stimulus

A distinctive environmental event that can activate the innate releasing mechanism (IRM) and release a fixed action pattern.

Fixed Action Pattern

A sequence of innate, unchangeable behaviors that is triggered by a specific stimulus and will be carried out to completion once started.

Action Specific Energy

A concept in ethology suggesting that certain behaviors build up energy within an organism, which then seeks release through specific actions.