Campbell Biology
Campbell Biology
12th Edition
ISBN: 9780135188743
Author: Urry
Publisher: PEARSON
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Chapter 54.1, Problem 3CC

MAKE CONNECTIONS Ø Figure 24.14 illustrates how a hybrid zone can change over time. Imagine that two finch species colonize a new island and are capable of hybridizing (mating and producing viable offspring). The island contains two plant species, one with large seeds and one with small seeds, growing in isolated habitats. If the two finch species specialize in eating different plant species, would reproductive barriers be reinforced, weak­ened, or unchanged in this hybrid zone? Explain.

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Which of these is an example of a key innovation?   A caterpillar of a butterfly species provides honey to an ant colony in order to receive protection and care.   A founding population of honeycreepers evolves beaks capable of cracking the seed of a tree species in their new habitat.   A new flower color morph arises in a plant population, but an associated pollinator does not distinguish flowers by color.   Co-occurring diploid species of wheat and goatgrass hybridize to form a viable tetraploid offspring that can no longer breed with its parents.
Try to outline a scenario explaining the evolution of the three species shown in panel g. Use migration, mutation, genetic drift, selection, reproductive isolation, gene flow, extinction, and many generations in your scenario. Based on your scenario, what are the components that are necessary in a population in order for it to split or diverge into two new daughter species from a single ancestor (the parent species)?

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