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TCE Biology (Tasmania): complete 2026 guide to the pre-tertiary Units 3 and 4

Study-note hub for TASC pre-tertiary Level 3/4 Biology in Tasmania, covering Unit 3 Heredity and Continuity of Life and Unit 4 Change Over Time, with dot-point notes, worked examples and exam tips.

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TCE Biology (Tasmania): Level 3/4 study notes

Welcome to the ExamExplained hub for Tasmanian TCE pre-tertiary Biology. This course is accredited by TASC and follows the Australian Curriculum senior Biology structure. These notes break the syllabus into focused dot points so you can revise one idea at a time.

Unit 3: Heredity and Continuity of Life

Unit 3 looks at how genetic information is stored, expressed and passed between generations, and at how that knowledge is applied through biotechnology.

  • DNA and gene expression
  • Inheritance and variation
  • Cell division: mitosis and meiosis
  • Biotechnology

Unit 4: Change Over Time

Unit 4 explains how populations and species change across generations, the evidence that supports evolution, and how new species form.

  • Natural selection and adaptation
  • Evidence for evolution
  • Speciation
  • Population genetics

Assessment overview

The TASC pre-tertiary Biology course is assessed through two complementary components. School-based internal assessment runs throughout the year, with your teacher rating your performance against the published TASC criteria using practical investigations, tests and reports. At the end of the course you sit a single TASC external examination that is common to all Tasmanian candidates. The combined result is reported on your Tasmanian Certificate of Education and contributes to your ATAR, so steady internal performance and strong exam technique both matter.

How to study with these notes

Start with the TL;DR in each dot-point file for a fast, accurate answer, then work through the detailed explanation, the worked example and the common-mistake call-out. Pair the notes with past TASC papers, your own practical data and active recall to lock in the concepts before assessment.

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Common questions about Biology

What is TCE pre-tertiary Biology in Tasmania?
It is the Level 3/4 senior Biology course accredited by TASC (the Office of Tasmanian Assessment, Standards and Certification). It follows the Australian Curriculum senior Biology structure and contributes to the Tasmanian Certificate of Education and your ATAR.
How is the course assessed?
Assessment combines school-based internal assessment of criteria across the year with a single TASC external examination at the end of the course. Both components are reported, and the result counts towards your ATAR.
Which units are studied at Level 3/4?
The pre-tertiary course covers four units. These notes focus on Unit 3 Heredity and Continuity of Life and Unit 4 Change Over Time, which deal with genetics, cell division, biotechnology, natural selection, evidence for evolution, speciation and population genetics.
What is the difference between internal and external assessment?
Internal assessment is conducted and marked by your school against TASC criteria using tasks such as practical reports, tests and investigations. The external examination is set and marked by TASC and is common to all candidates across Tasmania.
Do these notes match the official course?
They are organised around the Australian Curriculum senior Biology concepts that the TASC course follows. Always check the current TASC course document and your teacher's task sheets for exact wording and weightings, as these can change between years.
How should I use these dot-point notes?
Use each dot-point file to get a quick TL;DR answer, then read the fuller explanation, worked examples and common-mistake notes. Combine them with past papers and your own practical work to prepare for both internal tasks and the external exam.
What's the difference between mitosis and meiosis?
Mitosis produces two identical diploid cells (for growth and repair). Meiosis produces four genetically distinct haploid cells (for sexual reproduction).
How does protein synthesis work?
Transcription (DNA → mRNA in the nucleus) then translation (mRNA → polypeptide at the ribosome). tRNA brings amino acids that the ribosome links into the protein sequence the mRNA codes for.
What's homeostasis?
The maintenance of a stable internal environment (temperature, blood glucose, pH) despite external change — usually via negative feedback loops involving receptors, control centres, and effectors.
How does evolution by natural selection work?
Variation exists in a population → some variants survive and reproduce better in a given environment → those traits become more common over generations. Requires heritable variation, differential reproductive success, and time.
What's the difference between an antibody and an antigen?
Antigen: a molecule (often on a pathogen) that triggers an immune response. Antibody: a Y-shaped protein the immune system makes to bind specifically to that antigen.