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Grade 12 Life Sciences: modules and lessons

Explore Grade 12 Life Sciences: 17 modules and 117 lesson entries. Use the dorKk lesson guide to plan revision and catch-up study.

dorKk provides pre-recorded CAPS-aligned video lessons for self-paced study alongside schoolwork. Choose a module below, find the lesson that matches your classwork, and use the sequence to identify gaps. This guide lists lesson titles; access to the videos depends on your subscription. dorKk is not an online school.

Source: dorKk English lesson list dated 21 January 2026. Catalogue entries may differ from current app availability.

Plan your study

  1. Choose the module you are currently studying at school.
  2. Try a textbook question first and note where you get stuck.
  3. Watch the matching lesson, try again and keep a list of questions for your teacher.

INTRODUCTION TO LIFE SCIENCES

  1. 1.1.INTRODUCTION TO LIFE SCIENCES

CELL DIVISION

  1. 2.1.THE CELL CYCLE
  2. 2.2.MITOSIS
  3. 2.3.CANCER

DNA CODE OF LIFE

  1. 3.1.NUCLEUS; LOCATION OF NUCLEIC ACIDS
  2. 3.2.EXTRACELLULAR DNA AND GENES
  3. 3.3.STRUCTURE OF DNA
  4. 3.4.HISTORY OF DNA
  5. 3.5.DNA REPLICATION
  6. 3.6.DNA FINGERPRINTING

RNA

  1. 4.1.STRUCTURE OF RNA
  2. 4.2.TYPES AND LOCATION OF RNA
  3. 4.3.WHAT IS A PROTEIN
  4. 4.4.TRANSCRIPTION
  5. 4.5.TRANSLATION
  6. 4.6.GENETIC CODE

MEIOSIS

  1. 5.1.HAPLOID VS DIPLOID
  2. 5.2.INTRODUCTION TO MEIOSIS
  3. 5.3.MITOSIS REVISION
  4. 5.4.MEIOSIS 1
  5. 5.5.MEIOSIS 2
  6. 5.6.GENETIC VARIATION
  7. 5.7.PURPOSE OF REDUCTION DIVISION
  8. 5.8.ABNORMAL MEIOSIS
  9. 5.9.COMPARING MEIOSIS AND MITOSIS
  10. 5.10.SUMMARY

REPRODUCTION IN VERTEBRATES

  1. 6.1.INTERNAL VS EXTERNAL FERTILISATION
  2. 6.2.OVIPAROUS, VIVIPAROUS, OVOVIVIPAROUS
  3. 6.3.AMNIOTIC EGG
  4. 6.4.PRECOCIAL AND ALTRICIAL DEVELOPMENT
  5. 6.5.PARENTAL CARE

HUMAN REPRODUCTION

  1. 7.1.INTRODUCTION
  2. 7.2.PUBERTY
  3. 7.3.MALE REPRODUCTIVE SYSTEM
  4. 7.4.FEMALE REPRODUCTIVE SYSTEM
  5. 7.5.FEMALE CYCLES PART 1
  6. 7.6.FEMALE CYCLES PART 2
  7. 7.7.FERTILISATION OR CONCEPTION
  8. 7.8.ZYGOTE TO IMPLANTATION
  9. 7.9.GESTATION
  10. 7.10.GAMETOGENESIS

RESPONDING TO THE ENVIRONMENT (HUMANS)

  1. 8.1.INTRODUCTION TO THE NERVOUS SYSTEM
  2. 8.2.NEURONS
  3. 8.3.CNS BRAIN
  4. 8.4.SPINAL CORD
  5. 8.5.REFLEX ARC
  6. 8.6.DISORDERS OF CNS
  7. 8.7.STRUCTURE OF THE EYE
  8. 8.8.EYE; PATHWAY OF LIGHT
  9. 8.9.ACCOMMODATION
  10. 8.10.PUPILLARY MECHANISM
  11. 8.11.EYE PROBLEMS
  12. 8.12.STRUCTURE OF THE EAR
  13. 8.13.FUNCTIONING OF EAR HEARING
  14. 8.14.FUNCTIONING OF EAR BALANCE
  15. 8.15.HEARING DEFECTS

HUMAN ENDOCRINE SYSTEM

  1. 9.1.CHEMICAL COORDINATION
  2. 9.2.HYPOTHALAMUS AND PITUITARY GLAND
  3. 9.3.THYROID GLAND
  4. 9.4.PANCREAS
  5. 9.5.DIABETES AND MORE ABOUT INSULIN AND GLUCAGON
  6. 9.6.ADRENAL GLAND
  7. 9.7.HORMONES FROM REPRODUCTIVE GLANDS

HOMEOSTASIS IN HUMANS

  1. 10.1.MAINTAINING A CONSTANT INTERNAL ENVIRONMENT
  2. 10.2.MAINTAINING A CONSTANT INTERNAL ENVIRONMENT GLUCOSE
  3. 10.3.MAINTAINING A CONSTANT INTERNAL ENVIRONMENT CARBON DIOXIDE
  4. 10.4.MAINTAINING A CONSTANT INTERNAL ENVIRONMENT WATER
  5. 10.5.MAINTAINING A CONSTANT INTERNAL ENVIRONMENT SALT
  6. 10.6.MAINTAINING A CONSTANT INTERNAL ENVIRONMENT THERMOREGULATION

RESPONDING TO THE ENVIRONMENT; PLANTS

  1. 11.1.PLANT HORMONES; FUNCTIONS
  2. 11.2.PHOTOTROPISMS AND GEOTROPISMS
  3. 11.3.PLANT DEFENCE MECHANISMS

HUMAN IMPACT ON THE ENVIRONMENT

  1. 12.1.THE ATMOSPHERE; GREENHOUSE EFFECT, CARBON FOOTPRINT AND GLOBAL WARMING
  2. 12.2.WATER QUALITY
  3. 12.3.WATER AVAILABILITY
  4. 12.4.FOOD SECURITY; FACTORS THAT AFFECT THE SECURITY
  5. 12.5.LOSS OF BIODIVERSITY; HABITAT DESTRUCTION AND POACHING
  6. 12.6.ALIEN PLANTS AND INDIGENOUS KNOWLEDGE

BIODIVERSITY AND CLASSIFICATION

  1. 13.1.BIODIVERSITY; VARIETY OF LIFE ON EARTH
  2. 13.2.CLASSIFICATION SCHEMES; NAMING OF THINGS
  3. 13.3.FIVE KINGDOMS AND DICHOTOMOUS KEYS

GENETICS AND INHERITANCE

  1. 14.1.CONCEPTS IN INHERITANCE
  2. 14.2.MENDEL THE FATHER OF GENETICS
  3. 14.3.COMPLETE DOMINANCE PART 1
  4. 14.4.COMPLETE DOMINANCE PART 2
  5. 14.5.INCOMPLETE DOMINANCE AND CO
  6. 14.6.QUESTIONS EXPLAINED
  7. 14.7.SEX DETERMINATION
  8. 14.8.SEX LINKED INHERITANCE
  9. 14.9.BLOOD GROUPING
  10. 14.10.DIHYBRID CROSS
  11. 14.11.PEDIGREE DIAGRAMS
  12. 14.12.GENETIC ENGINEERING
  13. 14.13.MUTATIONS

HISTORY OF LIFE ON EARTH

  1. 15.1.PALEONTOLOGY; STUDY OF FOSSILS
  2. 15.2.FOSSIL DATING METHODS
  3. 15.3.GEOLOGICAL TIMESCALE IN THE SEAS
  4. 15.4.INVASION OF THE LAND
  5. 15.5.FACTORS THAT INFLUENCE EVOLUTION
  6. 15.6.MASS EXTINCTION
  7. 15.7.SOUTH AFRICAN FOSSILS AND FOSSIL TOURSM

EVOLUTION BY NATURAL SELECTION

  1. 16.1.EVOLUTION INTRODUCTION
  2. 16.2.LAMARCKISM
  3. 16.3.CHARLES DARWIN AND NATURAL SELECTION
  4. 16.4.PUNCTUATED EQUILIBRIUM
  5. 16.5.ARTIFICIAL SELECTION
  6. 16.6.FORMATION OF NEW SPECIES
  7. 16.7.REPRODUCTIVE ISOLATION
  8. 16.8.EVOLUTION IN PRESENT TIMES

HUMAN EVOLUTION

  1. 17.1.PHYLOGENETIC TREE FAMILY HOMINIDAE
  2. 17.2.SHARED CHARACTERISTICS BY HUMANS AND AFRICAN APES
  3. 17.3.DIFFERENCES BETWEEN AFRICAN APES AND MAN; BIPEDALISM
  4. 17.4.DIFFERENCES BETWEEN AFRICAN APES AND MAN
  5. 17.5.EVIDENCE FOR EVOLUTION; TOOLS, CULTURAL AND GENETIC
  6. 17.6.EVIDENCE FOR EVOLUTION
  7. 17.7.OUT OF AFRICA HYPOTHESIS
  8. 17.8.FOSSIL SITES IN SOUTH AFRICA

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