SPECIATION Ch pp Warm up 2/25:

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SPECIATION Ch. 16-3 pp. 326-330 Warm up 2/25: Define: Homologous Structures, Analogous Structures and Vestigial Organs/Structures. Give 1 example of each What is the main difference between a homologous structures and vestigial Structures. SPECIATION Ch. 16-3 pp. 326-330

Forming a new species Speciation: forming a new species Species: a group of organisms that can mate and produce fertile offspring 1. same number of chromosomes 2. similar morphology (body structure)

Species Types Morphological Species – Defined using similar characteristics. Biological Species – A species can reproduce and have fertile offspring. A group of organism that can successfully interbreed. Cannot breed fertile offspring with other species.

Disruptive Selection Divergent evolution that most likely results in two new species

Mechanisms Allopatric speciation caused by geographic isolation (physical separation of organisms)

Mechanisms Cont. Sympatric Speciation due to reproductive isolation (barriers to successful breeding) Prezygotic: before fertilization (i.e breeding times or home range) Postzygotic: after fertilization- infertile offspring (chromosome # doesn’t add up) Liger – Tiger and Lion produce an infertile offspring

Rates of Speciation Gradualism: slow divergence Punctuated equilibrium: sudden shift in form (irregular)

Homework: Tri-fold Vocab Due Tuesday 2/26 Genetic Drift Biological Species Concept Allopatric Speciation Sympatric Speciation Prezygotic Isolation Postzygotic Isolation Gradualism Punctuated Equilibrium Speciation Homework: Due Wednesday 2/27 Read p326-330 Do p 330 # 1-7 Study Guide & Raft Due Thursday Exam Friday: Intervention this week.