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
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:### Fossil Record and Evolution
1) **Approximately how far back in time does the fossil record extend?**
- 3.5 million years
- 5.0 million years
- 3.5 billion years
- 5.0 billion years
2) **How could the duplication of the Hox gene complex help facilitate animal adaptive radiation?**
- The new gene copies helped facilitate the evolution of more complex body plans.
- The new gene copies helped facilitate the evolution of smaller bodies.
- The new gene copies led to lower metabolic rates.
- It is unlikely that gene duplication events in the Hox complex played a role in the adaptive radiation of animals.
3) **Whatever its ultimate cause(s), the Cambrian explosion is a prime example of _______.**
- mass extinction
- evolutionary stasis
- adaptive radiation
- a large meteor impact
### Explanation of Terms:
- **Adaptive Radiation:** The process by which organisms diversify rapidly into a multitude of new forms, particularly when a change in the environment makes new resources available, creates new challenges, or opens new environmental niches.
- **Hox Genes:** A group of related genes that determine the basic structure and orientation of an organism. Duplications in these genes can lead to significant evolutionary changes.
- **Cambrian Explosion:** A period approximately 541 million years ago, during which most major animal phyla appeared in the fossil record.
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