SlideServe
Télécharger Obtenir Pro
Menu
Accueil Pro
Préférences
ApparenceLight Aide et commentaires
© SlideServe · v2026

The Evolutionary Journey: From Lamarck to Darwin and Beyond

osgood avatar
osgood
17 diapositives · 321 Views · Jul 16, 2014

Explore the origins of evolution, tracing ideas from Jean-Baptiste de Lamarck's theories on acquired characteristics to Charles Darwin's groundbreaking natural selection. Discover how environmental variations led to speciation on the Galapagos Islands during Darwin’s voyage on the Beagle. Learn about the complexities of biodiversity, types of evolution like adaptive radiation, and the effects of mass extinctions. This overview also delves into the mechanisms of natural selection and the evidence supporting evolutionary theory, revealing the intricate web of life on Earth.

The Evolutionary Journey: From Lamarck to Darwin and Beyond - slide 1
01 / 17The Evolutionary Journey: From Lamarck to Darwin and Beyond
1 / 17

Télécharger la présentation

The Evolutionary Journey: From Lamarck to Darwin and Beyond
Une image / un lien ci-dessous est fourni (tel quel) pour télécharger la présentation

Politique de téléchargement : le contenu du site vous est fourni TEL QUEL pour votre information et votre usage personnel ; il ne peut être vendu, concédé sous licence ni partagé sur d’autres sites sans l’accord de son auteur.Le contenu vous est fourni TEL QUEL, pour votre information et votre usage personnel uniquement. Téléchargez la présentation en cliquant sur ce lien. Lors du téléchargement, si vous ne parvenez pas à télécharger une présentation, l’éditeur a peut-être supprimé le fichier de son serveur.Pendant le téléchargement, si vous ne parvenez pas à obtenir une présentation, le fichier a peut-être été supprimé par l’éditeur.

F I N

Plus de contenu associé

Transcription de la présentation

  1. Domain VEvolution

  2. Origins of Evolution • Jean Baptiste de Lamarck and Acquired Characteristics • Charles Darwin • Charles Lyell’s Principles of Geology • Thomas Malthus called The Principles of Population • 40,000-mile trip on the Beagle

  3. Galapagos Islands • What did he find there? • Aquatic iguanas • Giant Tortoises • Species of finches

  4. 2 Themes Emerged • Variations within a species were dependent on the environment. • Organisms on the Galapagos Islands had become geographically separated resulting in reproductive isolationwhich leads to speciation.

  5. Natural Selection • Changes in a population that occur when organisms with favorable variations for that particular environment survive, reproduce and pass these variations on to the next generation.

  6. Darwin’s Theory • Decent with modification through natural selection. • Environmental Challenges result in certain traits increasing the reproductive fitness of certain individuals within a species.

  7. History of Life • Types of Evolution • Divergent (Adaptive Radiation) • Convergent • Rates of Evolution • Gradualism • Punctuated Equilibrium

  8. Types of Natural Selection • Stabilizing Selection • Directional Selection • Diversifying Selection • Disruptive Selection • Balancing Selection

  9. Diversifying Selection When a population is faced with conditions so diverse that no single phenotype is more successful that any other, genetic and phenotypic variability allow different selective pressures to operate at the same time.

  10. Balancing Selection operates to counteract the loss of variant alleles in a population. • Two forms of : heterozygote advantage and frequency-dependent selection.

  11. Biodiversity • Resulted from divergent evolution.

  12. Lines of Evidence • Incomplete Fossil Record >Relative Dating >Time Averaging >Radioisotope Dating • Building a Phylogeny >Phylogenetic Tree

  13. Mass Extinctions • Were catastrophic events the cause of mass extinctions, did they happen quickly or did they occur over a long period of time?

  14. If they occurred over a long period of time, why did the species not adapt to their changing environment in order to survive?

  15. Biological Resistance • Oysters in Malpeque Bay • Insect Resistance to Insecticides • Viruses • Gene Amplification