Chapter 20

Chapter 20 - Chapter 20: Development and Evolutionary...

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Chapter 20: Development and Evolutionary Change 20.1 – What is Evo-Devo? o The study of evolution and development is called evo-devo o Evo-devo means evolutionary developmental biology o The main principles of evo-devo are Groups of animals and plants share similar molecular mechanisms Molecular pathways maintain modularity, meaning developmental processes such as organ forming processes work independently from one another Changes in the location and timing of expressions of genes are important to evolution Morphological evolution by the modification of existing development genes and pathways Mechanisms of development have often evolved to be responsive to environmental conditions o Developmental genes in distantly related organisms are similar o Certain developmental mechanisms are controlled specific DNA sequences and have been conserved during the evolution of multicellular organisms. These sequences comprise of the genetic toolkit o Genetic toolkit reshuffles to create more diversity 20.2 – How can mutations with large effects change only one part of the body? o
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Chapter 20 - Chapter 20: Development and Evolutionary...

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