ANTH Lecture 8

Week 8 Overview (November 3)

  • Topics Covered

    • GTA Presentation: Dawn Bari

    • Contemporary Humans: A Self-Domesticated Ape?

    • Human Biological Diversity

  • Required Readings

    • Textbook: Chapters 9 & 10

    • Course Readings & Resources: Week 8

  • Lab 6:

    • Focus on Human Osteology: The Cranium

Midterm Test Information

  • Test Availability:

    • Online from 9:00 am on October 28 to 9:00 pm on October 29

    • Duration: 2 hours

  • Location: Anywhere with a secure and reliable internet connection

Important Instructions for Short Answer Questions

  • General Requirements:

    • Full sentences and correct grammar necessary for all answers

    • All answers must be original and paraphrased in the student's own words

  • Details to Include:

    • Provide as much detail as possible

    • Use examples to support and illustrate arguments

  • Further Instructions:

    • No references to support answers are required

    • Search engines or generative AI (e.g., ChatGPT) cannot be used

    • Answers will be checked for plagiarism with AI-detecting software

    • There will be a zero tolerance policy for any violations of the Trent Undergraduate Academic Integrity Policy

  • Marking Strategy:

    • Use the assigned marks for each question to gauge the expected depth of response

    • For example, a 3-mark question requires at least three distinct points, illustrated with examples

Self-Domestication in Humans

  • Research Insights:

    • Over the last 200,000 years, humans may have eliminated individuals displaying aggressive traits

    • Differences between human skulls and Neanderthal skulls suggest a selection for tameness

  • Source: Science News (2017) article discussing how humans may have domesticated themselves

Evolutionary Studies in Humans

  • Feature Articles:

    • The exploration of whether humans were the first domesticated species.

    • Insights into how tameness may have been selected through human evolution.

  • Embryonic Development Comparisons:

    • Comparisons of skull changes during development between chimpanzees and humans show differing degrees of change.

Domestication Phenomena

  • Case Studies:

    • The domestication process has been studied extensively in dogs (Canis familiaris) and silver foxes (Vulpes vulpes) in Siberia since 1959, highlighting selection traits based on human interaction.

    • In foxes, breeding selections involved minimal human contact and targeted individuals showing low reactivity towards humans at 7 months (measured by biting tendency and approach behavior).

  • Domestication Syndrome Features:

    • Various traits characteristic of domesticated species emerged in selected fox populations.

Origins of Modern Humans

  • Mitochondrial DNA Studies:

    • Initial genetic studies of human origins focused on mitochondrial DNA (mtDNA) analysis.

    • Research from Cann, Stoneking, and Wilson (1987) used mtDNA samples from 147 modern women across five ethnic groups from multiple continents.

    • Found:

    • Variation in modern human mtDNA is low—much lower than observed in chimpanzees.

    • Africans were found to have the greatest mtDNA variation, suggesting they are the oldest population and represent modern human origins.

Genetic Diversity in Humans

  • Genetic Research Observations:

    • Genetic diversity is expressed through percentage of sequence divergence among major geographical groups.

  • Race and Genetics:

    • Concepts of race are both biological and socially constructed; the significance requires understanding political implications.

    • Common categorizations produce artificial groupings, not naturally occurring races defined by nature.

The Concept of Race in Historical Context

  • Historical Perspectives:

    • Francis Galton (1822-1911), the founder of the Eugenics Movement, expressed fears that society was weakening due to natural selection failing to eliminate "unfit" members.

    • Galton produced composite images attempting to identify a criminal type based on physical traits.

  • Scientific Racism and Biological Concept of Race:

    • Linnaeus (1758) categorized races based on perceived characteristics, indicating a bias reflecting European perspectives towards other groups.

Conclusion and Reflections on Human Diversity

  • Reflecting Diversities:

    • The examination of Homo sapiens underscores both biological diversity and the social constructs surrounding the concept of race, revealing the complexities of genetics and sociopolitical realities.

Additional Notes

  • Visual Representations:

    • Illustrations within the studies discuss both juvenile skull comparisons and genetic variations vividly with reference to scientific resources as well as images from reputable publications like National Geographic.

  • Understanding Human Variation:

    • Insights from genetic research indicate misconceptions of racial variability and emphasize the importance of examining human genetic diversity within a broader African context.