Hybrid infertility - PowerPoint PPT Presentation

Chapter 16

Chapter 16 . The Origin of Species . Chapter 16 At a Glance . 16.1 What Is a Species? 16.2 How Is Reproductive Isolation Between Species Maintained? 16.3 How Do New Species Form? 16.4 What Causes Extinction? . 16.1 What Is a Species? . Biologists need a clear definition of species

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Evolution will _______ happen if all five of the following happen!

Evolution will _______ happen if all five of the following happen!. Population size is large Random mating is occurring No mutations No genes are introduced or lost No selection occurs Means: all genotypes can survive and reproduce equally well

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