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Mutations: CCG ACT A A G TAC CG G CCG ACT A G G TAC CG T PowerPoint Presentation
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Mutations: CCG ACT A A G TAC CG G CCG ACT A G G TAC CG T - PowerPoint PPT Presentation


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Production Order:. The fuel for natural selection is genomic variation that enables evolutionary adaption to proceed. Without fuel, the machine stops, at least until replenished by the accumulation of new mutations. . Organisms Adapted to Cambrian Selective Pressures:. The Raw Materials.

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Production Order:

The fuel for natural selection is genomic variation that enables evolutionary adaption to proceed.

Without fuel, the machine stops, at least until replenished by the accumulation of new mutations.

Organisms Adapted to Cambrian Selective Pressures:

The Raw Materials

Chemicals in land, sea and air

The Fuel

Mutations:

CCG ACT AAG TAC CGG

CCG ACT AGG TAC CGT

Genetic Variation

cambrian explosion timeframe
Cambrian Explosion Timeframe
  • Fossil Record suggests:
  • Evolutionary adaptation increases ~ 10 fold
  • All but one of the extant animal phyla appeared over ~ 20 million years, less than .5% of Earth’s geologic time
  • Other phyla appeared but did not survive (e.g., Vetulicolia)
  • The so called explosion abruptly terminated at about 515 million years ago, after which a biodiversity decline ensued

Begins at base of Cambrian period of Paleozoic Era, some 540 million years ago

gene flow
Gene Flow

Population B: red

Population A: blue

Offspring of immigrated has genotype Hh

Offspring of immigrated has genotype Hh

Gene flow is the transfer of alleles from one population to another population through immigration of individuals. In this example, one of the birds from population A (blue) immigrates to population B (red), which has less of the dominant alleles, and through mating incorporates its alleles into the other population.