Evolution: Natural Selection, Sources of Variety and Speciation

Use these online Evolution videos to study Natural Selection, Sources of Variety and Speciation. Use the video subtitles to improve Reading and Literacy skills ... simultaneously!

Use these Biology and Evolution videos entitled Natural Selection, Sources of Variety and Speciation to study the significant role played by natural selection in the evolution of species, and examine five patterns in which the mechanism of natural selection acts: stabilizing selection, directional selection, balancing selection, disruptive selection, and kin selection. 

Learn about the theory of natural selection, gene mutation, gene flow, and genetic shift. Use these 6 online educational video titles to explore the concepts of population, gene pools, and fitness. Examine natural selection as a mechanism for changing gene frequencies. Study mutation, recombination, and changes in chromosome structure and number as the sources of genetic variability in evolution. Learn about gene flow, genetic shift, and the process of geographic race formation.

Learning Objectives:

• Explore the significant role played by natural selection in the evolution of species, and examine five patterns in which the mechanism of natural selection acts: stabilizing selection, directional selection, balancing selection, disruptive selection, and kin selection.
• Gain an understanding of how a population evolves as the result of changes caused by mutation pressure, gene flow, and genetic drift in the gene frequencies of that population.
• Survey two sources of genetic variability in a population: mutation, which introduces new alleles; and the recombination of alleles through sexual reproduction.
• Examine allopatric speciation and instantaneous speciation involving polyploidy, and survey intrinsic reproductive isolating mechanisms that complete the divergence of genetically distinct populations by preventing crossbreeding through four different means.

• Biology > Biological Sciences > Evolution
• Natural Selection Part 1 (Runtime: 17:42)
• Natural Selection Part 2 (Runtime: 14:54)
• Sources of Variety Part 1 (Runtime: 14:45)
• Sources of Variety Part 2 (Runtime: 19:21)
• Speciation Part 1 (Runtime: 20:02)
• Speciation Part 2 (Runtime: 23:47)