Biological_Anthropology_Exam_Notes

Page 1: Introduction to Anthropology

  • What is Anthropology?

    • The study of similarities and differences, both biological and cultural, in human populations.

    • Aims to understand uniqueness and diversity of human behavior, discovering fundamental similarities connecting humans throughout time and space.

  • Anthropology vs. Social Sciences

    • Social sciences study human society and relationships.

    • Anthropology has the broadest scope, encompassing 4 different fields of study.

  • 4 Fields of Anthropology

    • Archaeology: Examines material remains of past societies to investigate culture.

    • Biological Anthropology: Focuses on human biological and physiological diversity.

    • Linguistic Anthropology: Studies human language in social and cultural contexts.

    • Cultural Anthropology: Investigates customary patterns in human behavior.

  • Core Concepts

    • Holism: Study cultures as a whole, considering the complete picture of human life.

    • Ethnocentrism: Viewing the world from one's own cultural perspective, providing a narrow view.

    • Cultural Relativism: Understanding cultural traits on their own terms, acknowledging that right and wrong can be culturally specific.

Page 2: Biological Anthropology Overview

  • Biological Anthropology

    • Concerned with human biological and physiological diversity.

    • Biocultural Approach: Humans develop from a combination of inherited biological traits and cultural influences.

  • Key Concepts

    1. Each person is a product of evolutionary history, encompassing all biological changes.

    2. Each person is shaped by individual life history, combining genetics and environment.

  • Specialized Areas

    • Paleoanthropology: Studies origins and evolution of the human species.

    • Primatology: Studies fossil and living non-human primates.

    • Forensic Anthropology: Identifies human remains for legal purposes.

    • Skeletal Biology & Osteology: Examines the skeleton and its growth patterns.

    • Paleopathology: Studies health and illness in past populations.

    • Anthropometry: Scientific study of body measurements and proportions.

    • Population Genetics: Studies genetic variation within populations.

    • Ethology: Investigates human behavior and social organization.

Page 3: Defining Humanity

  • What Makes Us Human

    • Bipedalism: Walking on two legs.

    • Loss of large canine tooth: Significant evolution in dental structure.

    • Culture: Accumulated knowledge and behaviors learned and shared.

    • Hunting: Development of cooperative strategies.

    • Speech: Essential for communication and social bonds.

    • Domestication of Food: Shaping human diets and societies.

    • Enculturation: Process of acquiring culture consciously and unconsciously.

      • Methods: situational, social, and symbolic learning.

  • Culture

    • Defined as shared and socially transmitted ideas, values, and perceptions.

    • Influences biology and personality, complex and interconnected.

    • Individual Level: Personal habits like morning coffee.

    • Group Level: National symbols like the national anthem.

  • Real vs. Ideal Culture

    • Ideal Culture: Norms and values that society believes should be followed.

    • Real Culture: Actual behaviors and values observed in society.

    • Material Culture: Physical objects created by a culture.

    • Nonmaterial Culture: Intangible products like beliefs or practices.

Page 4: Evolution of Biological Anthropology

  • Roots of Modern Biological Anthropology

    • 1856: Neanderthal discovery, impacting understanding of human ancestry.

    • 1859: Darwin publishes "On the Origin of Species", revolutionizing ideas on evolution and species change.

    • Mid-1800s: Increased reliance on anthropometrics (measurement of human bodies), pioneered by Alphonse Bertillon.

    • Early 20th century: Advances in combining genetics, anatomy, ecology, and behavior.

  • Class 2 - The Scientific Method

  • Roots of Modern Science:

    • Renaissance (14th-16th centuries): Rediscovery of classical ideas and cultural variations.

    • Global Exploration: Debates about polygenism (multiple origins) vs. monogenism (single origin).

  • Hypothesis Definition:

    • Educated guess or preliminary explanation of a phenomenon.

  • The Scientific Method

    • Data Collection: Gather repeatable observations.

    • Generalizations: Organizing data into patterns to form conclusions.

    • Logical Reasoning: Induction (generalization from specific observations) and deduction (conclusions drawn from existing observations).

Page 5: Human and Neanderthal Diets

  • Testing Hypothesis

    • Move from general to specific predictions through repetition and new data.

  • Diets

    • Humans: Focused on meat protein, less plant evidence.

    • Neanderthals: Wider dietary breadth, included both meat and plants (surf and turf diet).

Page 6: Genetics Fundamentals

  • Genetics

    • Study of heredity and inheritance of traits.

  • Blending Inheritance

    • Mixing traits (e.g., smooth and wrinkled plants).

  • Mendel's Pea Experiments

    • Studied traits with clear forms.

    • Focused on traits like green/yellow seeds and smooth/wrinkled seeds.

    • Results showed predictable ratios (3:1 for yellow/green).

  • Mendel's Discoveries

    • Traits passed down through defined "particles" (genes) on chromosomes.

    • Principles:

      • Segregation: Traits determined jointly by two particles.

      • Independent Assortment: Different traits inherited independently.

  • Cell Features

    • Composed of membrane, nucleus, cytoplasm, and organelles.

  • Chromosomes

    • Human cells contain 46 chromosomes; chimpanzees and gorillas 48.

Page 7: DNA and Genetics

  • Chromosome Anatomy

    • Chromatid contains DNA; centromere joins chromatids.

  • Karyotype

    • Composed of 22 pairs of autosomes and 1 pair of sex chromosomes (XX=female, XY=male).

  • DNA

    • Composed of nucleotides with base pairs (A,T,C,G).

    • Essential for encoding genetic information.

  • Gene Types

    • Structural Genes: Code for proteins and enzymes.

    • Regulatory Genes: Control gene expression.

  • Alleles

    • Variants of a gene inherited from each parent.

    • Homozygous: Same alleles; Heterozygous: Different alleles.

    • Dominant & Recessive Alleles: Dominant masks recessive trait.

  • Inheritance Types

    • Monogenic: One gene, one trait.

    • Polygenic: Traits influenced by multiple genes.

Page 8: Forces of Evolution

  • Evolution

    • Change in genetic make-up over time.

  • Genetic Equilibrium

    • No change in allele frequencies from generation to generation.

  • Hardy-Weinberg Principle

    • Conditions for allele and genotype frequency stability:

      1. Allele frequencies remain constant.

      2. Genotype frequencies stable.

      3. Consistent relationship between allele and genotype frequencies.

  • Forces of Evolution

    • Genetic Drift: Random changes in allele frequencies.

    • Mutations: Mistakes in gene replication, introducing variation.

    • Gene Flow: Transfers alleles between populations.

    • Natural Selection: Adaptive change enhancing survival and reproduction.

  • Types of Natural Selection

    • Directional Selection: Favors traits differing from the average.

    • Stabilizing Selection: Favors average traits.

    • Sexual Selection: Focuses on traits increasing mate acquisition success.

Page 9: Evolutionary Concepts

  • Types of Sexual Selection

    • Intersexual Selection: Traits making males attractive to females.

    • Intrasexual Selection: Traits enhancing male competition.

  • Macroevolution

    • Evolution occurring at or above the species level, affecting broad gene pool changes.

Page 10: Primate Characteristics

  • Why Study Primates?

    • Understand evolutionary history through shared traits and behaviors.

  • Characteristics

    • Prehensile hands and feet, nails with tactile pads, and evolved vision.

    • Generalized body plans and reduced teeth count.

    • Larger brain relative to body size, mainly found in tropical regions.

  • Locomotion

    • Methods include brachiation (arm-swinging) and habitual bipedalism.

  • Life History Traits

    • Primates have small litters, prolonged pregnancies and juvenile periods.

  • Differences Between Humans and Primates

    • Cranium structure and jaw shape (humans are orthognathic, primates are prognathic).

Page 11: Primate Suborders & Classification

  • Primate Classification

    • Suborders:

      • Prosimii: Nocturnal prosimians found in Madagascar; reliance on smell.

      • Strepsirhini: Lemuriformes, including lemurs in Madagascar.

      • Haplorhini: Tarsiformes and anthropoids, characterized by strong vision and sociality.

      • Infraorder Platyrrhini: Flat-nosed, arboreal primates.

      • Infraorder Cercopithecoidea: Old World monkeys with specific dental and anatomical traits (i.e., ischial callosities).

  • Great Apes

    • Orangutans: Reddish/brown hair, mostly arboreal.

    • Gorillas: Largest living primates with a diet predominantly of leaves.

    • Chimpanzees: Closest relatives to humans with diverse social systems.

    • Bonobos: Noted for fruit diet and strong female relationships.

Page 12: Primate Behavior & Social Structure

  • Primate Behavior Studies

    • Research focuses on cognitive development, social structures, and cooperation.

  • Communication

    • Various methods like vocalization and physical gestures.

  • Advantages of Group Living

    • Foraging efficiency and protection against predators.

  • Factors Influencing Group Size

    • Food distribution and safety against predation.

  • Mating Systems

    • Influenced by group size; small groups encourage monogamy, while larger groups support polygamous arrangements.

Page 13: Case Studies of Gibbons and Galagos

  • Case Study: Gibbons and Siamang

    • Tropical rainforest dwellers using brachiation, living in small family units.

    • Pairs exhibit monogamous behaviors; parental care shared but varies by sex.

  • Case Study: Galago

    • Nocturnal, arboreal, and insectivorous.

    • Utilize trees for shelter at night; social behaviors observed among females.

Page 14: Case Study of Gorillas

  • Case Study: Gorilla (Gorilla gorilla)

    • Live in equatorial Africa, primarily ground dwellers.

    • Males display protective behaviors as silverbacks, with less direct parenting to offspring.

    • Diet consists predominantly of foliage and occasional fruits.

Page 15: Fossil Formation & Preservation

  • How Fossils Are Formed

    • Involves processes like sedimentation and mineral replacement.

  • Processes of Preservation

    • Wet environments create anaerobic conditions advantageous for fossilization.

  • Notable Finds

    • The Tollund Man: A well-preserved bog body from Denmark.

    • Otzi the Iceman: Found in the Alps, dating back over 5,300 years.

Page 16: Fossil Dating Methods

  • Dating Fossils

    • Relative Dating: Determines age relative to other specimens.

    • Absolute Dating: Provides definitive ages using specific time scales.

  • Dating Techniques

    • Law of Superposition: Older layers are deeper than younger layers.

    • Radiocarbon Dating: Measures decay of radioactive isotopes to estimate age (half-life of 5730 years).

  • Isotope Usage

    • Radiogenic dating measures natural decay rates of elements to establish timelines.

Page 17: Isotope and Dating Techniques

  • Isotopes

    • Variants of the same element differing in atomic weight, essential for dating methods.

  • Radiometric Dating

    • Uses radioactive decay to establish ages of archaeological finds, such as potassium-argon and carbon-14 dating.

  • Challenges

    • Contamination issues and effects from marine reservoirs can mislead dating accuracy.

Page 18: Geologic Time Frame

  • Geologic Time Frame

    • Illustrates the timeline of species evolution, such as the appearance of Homo sapiens represented as a moment close to midnight on December 25th.