Title: Week 3 overview
Course: BIO-182 RTZ > Section: Week 3 - Speciation

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TO DO before [Date/Time selected here]:

- Read Chapter 23 (Speciation).
- Complete: LaunchPad Learning Curve (Chapter 23)
- Complete: LaunchPad Learning Activities (Chapter 23)
- Complete: LAB: Evolutionary Evidence
- Optional: LaunchPad Summary Quiz
- Optional: Exam 1c  (Insert due date here)

CHAPTER OVERVIEW:

Chapter 23 – Speciation. This chapter explores the formation of species. Before we can discuss the mechanisms of speciation, it is important to define what we mean by a "species."

- Section 23.1 discusses three definitions of a "species." While it may seem a simple thing, each definition has it's challenges. The most recent and widely accepted definition is the lineage (or phylogenetic) species. Read this section carefully.
- Recall from the previous chapters that speciation has a genetic basis however not all evolutionary change results in new species. Closely related species are considered true species only when they can no longer interbreed and produce viable offspring. Section 23.2 looks at the genetic basis of speciation. Skim the Dobzhansky-Muller model, focussing on the the mechanisms that lead to reproductive isolation, including genetic incompatibility and the effect of hybrids.
- In section 23.3, the authors discuss barriers to gene flow. Read this section carefully.
- Once new species have formed, what mechanisms prevent hybridization? Read chapter 23.4 to review isolating mechanisms (both pre- and post-zygotic). This is important information, read this section carefully.
- Finally, rates of speciation vary. Scan section 23.5  with an eye to the factors that may influence rate of speciation.

SUPPLEMENTAL MATERIAL: Please note that reading/viewing these materials are completely optional,  although you may find some of them interesting and/or helpful.

- Speciation: of Ligers and Men (Crash Course Biology)

https://www.youtube.com/watch?v=2oKlKmrbLoU

- Speciation (Bozeman Biology)

https://www.youtube.com/watch?v=rlfNvoyijmo

- Speciation: An illustrated Introduction (The Cornell Lab or Ornithology)

https://www.youtube.com/watch?v=8yvEDqrc3X

- Speciation: a lecture

https://www.youtube.com/watch?v=n4mvuhwRfpc

INTERESTING ARTICLES/ documentaries:

- The Blind Watchmaker featuring Richard Dawkins (1987)

https://www.youtube.com/watch?v=0k9Bwt_aHq4

- Evolution: What Darwin Never Knew (NOVA; a PBS documentary)

https://www.youtube.com/watch?v=AYBRbCLI4zU