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16.7

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Chapter 16
Evidence of Evolution
Section 16.7
© Cengage Learning 2015
16.7 What Evidence Does Evolution Leave
In Body Form?
• Clues about the history of a lineage may be found
– In body form, function, and biochemistry
• Comparative morphology
– Shows similarities in structure of body parts
– Reflects shared ancestry
– Can be used to unravel evolutionary relationships
© Cengage Learning 2015
What Evidence Does Evolution Leave In
Body Form?(cont’d.)
• Morphological divergence
– Change from the body form of a common ancestor
• Homologous structures
– Body parts that appear different in different lineages, but are
similar in some aspect
• Become modified to a different size, shape, or function in different
lineages
– Are evidence of a common ancestor
© Cengage Learning 2015
What Evidence Does Evolution Leave In
Body Form?(cont’d.)
• Morphological convergence
– Independent evolution of similar body parts in different lineages
• Analogous structures
– Body parts that look alike in different lineages but did not
evolve in a common ancestor
© Cengage Learning 2015
What Evidence Does Evolution
Leave In Body Form?(cont’d.)
Insects Bats Humans Birds Crocodiles
wingswingswings
limbs with 5 digits
ancient common ancestor
Figure 16.14 Morphological convergence in animals. The surfaces of an
insect wing, a bat wing, and a bird wing are analogous
structures. The diagram shows how the evolution of wings (yellow dots)
occurred independently in the three separate lineages that led to
bats, birds, and insects.

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16.7

  • 1. Chapter 16 Evidence of Evolution Section 16.7
  • 2. © Cengage Learning 2015 16.7 What Evidence Does Evolution Leave In Body Form? • Clues about the history of a lineage may be found – In body form, function, and biochemistry • Comparative morphology – Shows similarities in structure of body parts – Reflects shared ancestry – Can be used to unravel evolutionary relationships
  • 3. © Cengage Learning 2015 What Evidence Does Evolution Leave In Body Form?(cont’d.) • Morphological divergence – Change from the body form of a common ancestor • Homologous structures – Body parts that appear different in different lineages, but are similar in some aspect • Become modified to a different size, shape, or function in different lineages – Are evidence of a common ancestor
  • 4. © Cengage Learning 2015 What Evidence Does Evolution Leave In Body Form?(cont’d.) • Morphological convergence – Independent evolution of similar body parts in different lineages • Analogous structures – Body parts that look alike in different lineages but did not evolve in a common ancestor
  • 5. © Cengage Learning 2015 What Evidence Does Evolution Leave In Body Form?(cont’d.) Insects Bats Humans Birds Crocodiles wingswingswings limbs with 5 digits ancient common ancestor Figure 16.14 Morphological convergence in animals. The surfaces of an insect wing, a bat wing, and a bird wing are analogous structures. The diagram shows how the evolution of wings (yellow dots) occurred independently in the three separate lineages that led to bats, birds, and insects.

Editor's Notes

  1. Figure 16.14 Morphological convergence in animals. The surfaces of an insect wing, a bat wing, and a bird wing are analogous structures. The diagram shows how the evolution of wings (yellow dots) occurred independently in the three separate lineages that led to bats, birds, and insects.