Bilateral symmetry and the anus forming at or near the site of the blastopore characterize deuterostomes. True False

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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### Educational Content on Deuterostomes

**Statement:**

Bilateral symmetry and the anus forming at or near the site of the blastopore characterize deuterostomes.

**Options:**

- ◯ True
- ◯ False

**Explanation:**

In the context of biology, deuterostomes exhibit a distinct developmental mode. One of the defining characteristics of deuterostomes is bilateral symmetry, which means their body plan is symmetrical along a central axis. Another critical feature is that during embryonic development, the blastopore (the first opening in the developing embryo) becomes the anus, while the mouth forms secondarily. This is in contrast to protostomes, where the blastopore develops into the mouth. Understanding these differences is essential for studying evolutionary biology and the classification of animal species.
Transcribed Image Text:### Educational Content on Deuterostomes **Statement:** Bilateral symmetry and the anus forming at or near the site of the blastopore characterize deuterostomes. **Options:** - ◯ True - ◯ False **Explanation:** In the context of biology, deuterostomes exhibit a distinct developmental mode. One of the defining characteristics of deuterostomes is bilateral symmetry, which means their body plan is symmetrical along a central axis. Another critical feature is that during embryonic development, the blastopore (the first opening in the developing embryo) becomes the anus, while the mouth forms secondarily. This is in contrast to protostomes, where the blastopore develops into the mouth. Understanding these differences is essential for studying evolutionary biology and the classification of animal species.
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