BELL WORK
Write the following words in your notebooks:
1. Speciation 物种进化
2. Allopatric Speciation 分区物种形成
3. Sympatric Speciation 同地物种形成
4. Reproductive isolation 生殖隔离
5. Geographic isolation 地理隔离
6. Behavioral seperation 行为分离
UNIT 2: EVOLUTION
Lesson: Speciation
WHAT IS SPECIATION?
• In Chinese, it means 物种形成.
• In English, Speciation is the process by which new species form.
Speciation occurs when populations of the same species are separated,
resulting in reduced gene flow, which over time allows populations to
become genetically distinct from one another.
• Geographic separation
• Habitat specialization
• Behavioral separation
• Mechanical separation
2 TYPES OF SPECIATION
• Allopatric speciation— involves
geographic separation of populations from a
parent species and subsequent evolution.
• Sympatric speciation— involves
speciation occurring within a parent species
remaining in one location.
• Behavioral isolation
• Temporal isolation
• Habitat isolation
RATES OF
SPECIATION
• Rates of speciation and extinction have fluctuated throughout Earth’s history in response to changing
environmental conditions.
• Major Factors affect rates of speciation/extinction:
• Environmental Conditions
• Geographic separation
PROJECT: STORYBOOK ABOUT
EVOLUTION
• Work in groups of 2
• You are going to create a storybook using PPT
• Your storybook should apply the concept of evolution:
- The Theory of Evolution
- Patterns of Evolution
- Mechanisms of Evolution
- Speciation
• Your storybook should have story created by your group and also images
suitable for your story