Evolution, Genetics, and Key Vocabulary — Study Notes Summary & Study Notes

🌱 Evolution & Biodiversity

Evolution is defined as the long-term genetic change in a population and is supported by multiple lines of evidence including fossils, comparative anatomy, and molecular data. Biodiversity describes variation at the species and genetic levels and is shaped by evolutionary processes and historical events like continental drift.

🧬 Mechanisms of Evolution

Five primary mechanisms drive evolutionary change: mutation, gene flow, genetic drift, natural selection, and sexual reproduction. Mutations introduce new variation, gene flow mixes variation between populations, genetic drift causes random allele frequency changes (especially in small populations), natural selection favors advantageous traits, and sexual reproduction reshuffles genes through meiosis and fertilization.

🧫 Antibiotic Resistance & Traditional Medicine

Natural selection explains the rise of antibiotic resistance, where resistant bacteria survive treatments and reproduce. Traditional Aboriginal medicines (e.g., tea tree and emu bush) are being studied as potential antimicrobial resources, highlighting the value of Indigenous knowledge and ethical collaboration in drug discovery.

🐾 Speciation, Artificial Selection & Human Impacts

Speciation occurs when reproductive isolation and differing selection pressures produce distinct species. Artificial selection (selective breeding) shows how humans can rapidly change traits but also reduce genetic diversity in crops and breeds, increasing vulnerability to disease. Conservation is crucial to preserve genetic variation and unique Australian fauna.

🗂️ Biostratigraphy & Dating Methods

Correlation (biostratigraphy) uses index fossils to match rock layers across regions, while absolute (radiometric) dating uses isotope decay (e.g., Carbon-14 and Uranium-235) to estimate ages. These methods reconstruct timelines for events like the coexistence of humans and megafauna.

🧬 DNA & the Central Dogma

DNA stores hereditary information as a double helix built from nucleotides (deoxyribose, phosphate, and bases A, T, C, G). The central dogma describes information flow: transcription produces mRNA from DNA, and translation uses mRNA codons at ribosomes to assemble proteins from amino acids.

🔬 Cell Division: Mitosis & Meiosis

Mitosis produces two genetically identical diploid daughter cells for growth and repair, following stages summarized as IPMAT (Interphase, Prophase, Metaphase, Anaphase, Telophase) plus cytokinesis. Meiosis is a reduction division producing four genetically unique haploid gametes and includes crossing over during Prophase I, which increases genetic variation.

🧪 Inheritance, Mutations & Chromosomes

Mendelian concepts (dominant/recessive alleles, Punnett squares) predict inheritance patterns, while chromosomal abnormalities (e.g., aneuploidy such as Down syndrome) arise from nondisjunction. Mutations can be germline or somatic and range from neutral to harmful or beneficial; point mutations include substitutions, insertions, and deletions.

🧾 Genetic Testing & Engineering

Techniques like karyotyping and non-invasive prenatal testing (NIPT) screen for chromosomal issues. Genetic engineering and CRISPR offer ways to edit genes and treat disorders, raising ethical issues about privacy, equity, and long-term impacts.

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