Grade 12 Biology Unit 4: Evolution

This unit 4, “Evolution,” examines the scientific explanations for the origin and development of life. You will explore the theories and evidence supporting the concept that modern living things evolved from a common ancestor, while also studying the specific mechanisms—such as natural selection and mutation—that drive biological variation.

Chapter 4.1 – Evolution

This extensive chapter covers the core principles and mechanisms of biological evolution.

• Definitions and Theories: Define evolution and analyze different views and theories regarding the origin of life.
• Evidence: Describe the scientific evidence for evolution that supports the theory of common ancestry.
• Natural Selection: Study the definition, types, and examples of natural selection, appreciating its role as a mechanism for “survival of the fittest”.
• Human Evolution: Explore the specific timeline and characteristics of human evolution.
• Mechanisms of Change: Explain the major causes of variation and evolution, including mutation, genetic drift, and gene flow (immigration and emigration).
• Extinction: Understand the causes of species extinction.

Chapter 4.2 – Renowned Anthropologists in Ethiopia

This section highlights local contributions to the field.

• Local Figures: Learn about renowned anthropologists in Ethiopia and their contributions to understanding human origins.

Chapter 4.3 – Renowned Evolutionists in Ethiopia

This section continues the focus on Ethiopian scientific contributions.

• Scientific Contribution: Identify renowned evolutionists in Ethiopia and their role in the study of evolution.

Learning Outcomes

By the end of this unit, you will be able to:

• Analyze different views about the origin of life and evaluate them from a scientific perspective.
• Describe scientific evidence to support that modern living things have evolved from a common ancestor.
• Explain the major causes of evolution that lead to variation in organisms.
• Appreciate the role of natural selection and survival of the fittest in evolution and day-to-day life.