ap biology - unit 7: reproductive barriers & speciation

timestamps

• 0:00

  Introduction to Macroevolution

• 0:03

  Macroevolution Graphic Explanation

• 0:35

  Cladogram and Species Relations

• 1:06

  Common Ancestors in Evolution

• 1:37

  Misconception: Humans from Monkeys

• 2:07

  Defining Species and Speciation

• 2:38

  Biological Species Concept

• 3:08

  Viable Fertile Offspring

• 3:39

  Species Differentiation Criteria

• 4:10

  Gene Flow and Populations

• 4:42

  Stopping Gene Flow

• 5:12

  Reproductive Isolation Barriers

• 5:43

  Preventing Gene Flow

• 6:13

  Pre and Post Zygotic Barriers

• 6:45

  Textbook Figure Breakdown

• 7:17

  Zygote Definition

• 7:48

  Pre-Zygotic Barriers Overview

• 8:18

  Habitat Isolation Example

• 8:49

  Temporal Isolation Skunks

• 9:20

  Timing in Mating

• 9:50

  Behavioral Isolation Rituals

• 10:21

  Courtship Dances in Birds

• 10:53

  Mechanical Isolation Snails

• 11:25

  Gametic Isolation Fusion

• 11:55

  Summary of Pre-Zygotic

• 12:26

  Post-Zygotic Barriers Introduction

• 12:58

  Energy in Reproduction

• 13:30

  Reduced Hybrid Viability

• 14:02

  Reduced Hybrid Fertility Mules

• 14:33

  Hybrid Breakdown in Grasses