Evolution of Development

Chapter 25

The Evolutionary Paradox

Diverse morphologies are regulated by highly conserved genes.

Example, the Hox genes

Developmental changes can lead to evolutionary changes

Heterochrony

Homeosis

Changes in transcription factors

Changes in signaling pathways

One or Two Gene Mutations, New Form

The Brassica Example

Same Gene, New Function

Pitx1 and the Sticklebacks

Different Genes, Convergent Function

Homeoplastic structures

Gene Duplication and Divergence

Morning glories and pigment

Diversity of the Eyes