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Genetic Drift. Small populations Definition Genetic bottleneck Founder effect.

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Genetic drift
Genetic Drift

Small populations

Definition

Genetic bottleneck

Founder effect


You are wandering in the tropical rainforest and a giant bright yellow spider hangs dangling in its web in front of you. How would you determine if you had discovered a new species of spider? If it was a new species of spider, what would you name it?


Why do we classify organisms
Why do we classify organisms? bright yellow spider hangs dangling in its web in front of you. How would you determine if you had discovered a new species of spider? If it was a new species of spider, what would you name it?

  • Communication

    • Problems with common names

  • Show evolutionary relationship

  • Systematics

    • Taxonomy


Scientific names
Scientific Names bright yellow spider hangs dangling in its web in front of you. How would you determine if you had discovered a new species of spider? If it was a new species of spider, what would you name it?

  • 18th century

    • Latin or Greek

  • Binomial nomenclature

    • Linnaeus

    • 2 word name

    • Latin

    • Writing

      • Italics

      • First word – Genus

      • Second word – species

      • Felis catus


Linnaean classification
Linnaean Classification bright yellow spider hangs dangling in its web in front of you. How would you determine if you had discovered a new species of spider? If it was a new species of spider, what would you name it?

  • Hierarch ranking system

  • Taxa (taxon)

  • Kingdom, phylum, class, order, family, genus, species


Problems with linnaean classification
Problems with Linnaean Classification bright yellow spider hangs dangling in its web in front of you. How would you determine if you had discovered a new species of spider? If it was a new species of spider, what would you name it?

  • Species are specifically defined

  • Other groups are subjective

  • New organisms hard to classify

  • Eugenics

    • Classification of humans

    • Used to justify discrimination


The following is the Linnaean classification of a moose. Match each with the appropriate category name. Hint: they are in order.

  • alces

  • Alces

  • Cervidae

  • Artiodactyla

  • Mammalia

  • Chordata

  • Animalia


Evolutionary classification
Evolutionary Classification Match each with the appropriate category name. Hint: they are in order.

  • Darwin’s tree of life

  • Phylogeny

  • Group by common ancestors

  • Clades

    • Definition

    • Advantage


Cladograms
Cladograms Match each with the appropriate category name. Hint: they are in order.

  • Root

  • Branch

    • Speciation event

  • Distances

  • Patterns based on

    • Hypotheses

    • Molecular data

    • Embryological development

    • Fossil record


Creating cladograms
Creating Cladograms Match each with the appropriate category name. Hint: they are in order.

  • Traits inherited

    • From common ancestor

    • Shared by many

    • Examples

  • Derived characters

    • Related to speciation event

    • Show closeness of common ancestor


Reading cladograms
Reading Cladograms Match each with the appropriate category name. Hint: they are in order.

  • Node

  • Derived characteristics

  • Last clade


Clades and linnaeus
Clades and Linnaeus Match each with the appropriate category name. Hint: they are in order.

  • Many overlapping groups

    • Mammalia

  • Birds very different

  • Both systems are used


Dna and classification
DNA and Classification Match each with the appropriate category name. Hint: they are in order.

  • Used sequenced genomes

  • More genes in common

    • More derived characters in common

    • More recent common ancestor

  • Shows relationships that can’t be seen

    • Examples


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