)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

Human Anatomy & Physiology (11th Edition)
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Chapter1: The Human Body: An Orientation
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### 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.
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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