1A
Page 1: Introduction to BIOL 243
Course Overview: DNA, Inheritance, and Evolution.
Key Groups of Organisms:
Eukaryotes: Includes plants, fungi, and protists.
Archaea: Single-celled microorganisms similar to bacteria.
Bacteria: Prokaryotic organisms, crucial in various ecosystems.
Plants: Various forms such as flowering plants, cycads, horsetails, and conifers.
Fungi: Includes choanoflagellates, amoebas, red algae, and green algae.
Multicellular Organisms: Includes sponges and corals.
Extinct Species and Events:
Notable extinct species: trilobites, ammonites, and certain fish.
Historical events: mass extinctions, global ice ages, and the Cambrian explosion.
Evolution Timeline:
Illustrates key evolutionary milestones over millions of years.
Page 2: Course Logistics
Welcome Message: Introduction by Bill Huddleston.
Contact Information:
Email: wrhuddle@ucalgary.ca
Office hours by appointment.
Page 3: Class Structure and Expectations
Class Schedule: Classes will start and end on time.
Lecture Materials:
Lecture note outlines will be available on D2L.
Recordings of lectures will also be posted.
Learning Support:
Office hours and email support available for questions.
Page 4: Key Theme of Genetics
Theme 1A: DNA as the Molecule of Heredity.
Reference Text:
Pages: 266-269, 675-677.
Page 5: Biological Diversity
Life Forms: Approximately 1.7 million species identified, representing ~1/5 of estimated diversity.
Historical Context: Life began approximately 3.5 billion years ago.
Extinction: 20% of species are currently extinct.
Page 6: Adaptation and Evolution
Biological Diversity: A result of interactions and changes over time.
The process is explained through evolution.
Page 7: Natural Selection Criteria
Requirements for Evolution:
Survival of advantageous mutations is crucial.
Page 8: Heredity and Inheritance
Definition: Transmission of traits from one generation to the next.
Historical Context: Humans have bred crops and livestock for desirable traits for centuries.
Definition of Traits: Any heritable characteristic of an individual.
Page 9: Evolutionary Understanding
Historical Beliefs:
New species arise through interbreeding within species.
Parental traits were thought to blend; acquired traits were thought to be inherited.
Page 10: Historical Theories of Inheritance
Hartsoeker's Preformation Theory: Hypothesized that sperm contained miniature humans.
Page 11: Gregor Mendel's Contributions
Mendel's Experiments: Studied inheritance in garden peas.
Developed the theory of particulate inheritance, which later related to DNA.
Page 12: Understanding Molecular Genetics
Definition of Genetics: Study of heredity and variation at the molecular level.
Focus: Molecular events in gene expression and inheritance.
Page 13: Importance of Molecular Genetics
Applications:
Human health, forensics, agriculture, and evolutionary biology.
Page 14: Genome Sequencing
Genomic Analysis: Involves a wide variety of organisms and a focus on understanding RNA and protein impact on phenotype.
Page 15: Genotype vs. Phenotype
Definitions:
Genotype: Specific DNA sequence and genetic makeup of an individual.
Phenotype: Observable characteristics determined by genotype and environment.
Page 16: Gene Expression Mechanisms
Process: Involves transcription and translation of genes to produce proteins.
Central Dogma of Molecular Biology: DNA -> RNA -> Protein.
Page 17: Role of Protein Expression
Protein Expression: Determines the phenotype of an organism through various cellular functions.
Page 18: Phenotypic Variation
Causes: Variations stem from genetic differences and gene expression regulation.
Page 19: Chromosome Theory of Inheritance
Chromosome Behavior in Meiosis supports Mendel's hypotheses on inheritance.
Page 20: Composition of Chromosomes
Chromosomes are made up of both DNA and proteins, with DNA being the primary carrier of genetic information.
Page 21: Classical Experiments Establishing DNA
Key Experiments:
Griffith's transformation experiment.
Avery et al.'s identification of DNA as the transforming principle.
Hershey and Chase's use of bacteriophages to prove DNA's role in inheritance.
Page 22: Streptococcus pneumoniae Overview
Characteristics of the pathogen responsible for pneumonia; distinction between virulent and non-virulent strains.
Page 23: Griffith's Transformation Principle
Griffith's findings on genetic transformation and the permanence of the transformation.
Page 24: Avery, MacLeod & McCarthy's Hypothesis
Experiment to determine whether proteins, RNA, or DNA served as the transforming principle.
Page 25: Avery’s Methodology
Steps taken to isolate and identify the transforming molecule.
Page 26: Hershey and Chase Experiment
Focused on whether DNA or protein acts as the genetic material, using bacteriophages.
Page 27: Bacteriophage Life Cycle
Overview of the lytic cycle of bacteriophages and their effect on E. coli.
Page 28: Summary of Hershey and Chase's Results
Differences in radioactive labeling established that DNA is the genetic material.
Page 29: Learning Objectives
Understanding key concepts related to genetics, gene function, and research methodologies.