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Chapter 1 & 3

BIOB51H3 Chapter 1 & 3: BIOB51H3 Chapter 1 & : BIOB51H3 Chapter 1 &: BIOB51H3 Chapter 1 : BIOB51H3 Chapter 1 : BIOB51H3 Chapter 1 : 4

Biological Sciences
Course Code
Maydianne Andrade
1 & 3

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Defining Adaptation
o An adaptation refers to an inherited trait that makes an organism more fit in its
abiotic and biotic environment, and that has risen as a result of the direct action
of natural selection for its primary function
Adaptations and Fit to Environment
o To be considered an adaptation, a trait must have been shaped by natural
selection to serve the same primary function or functions that make it beneficial
o Exaptations
o A trait that serves one function today but may have evolved under
different selection conditions and served a different function in the past
Chapter 1: An Overview of Evolutionary Biology
1.2: Empirical and Theoretical Approaches to the Study of Evolution
Empirical Approaches
o Empirical work in evolutionary biology almost always falls under one of two
o Observations
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