Life Sciences Memo 2 (English)

May-June 2023 — Grade 12 / Matric — Life Sciences

Memo 2023 Grade 12 English Life Sciences Hub →

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🎯 150 marks 📄 11 pages 📝 39 items found 📚 2 topics

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Q1— Section header —

1.2.6.2.7 Incomplete dominance Chiasma /chia mata Transcription Deoxyribose

1.3.3Both A and B None B only x 2\ (6\

1.4.1(a\ (b\ (c\ Prophase I Twelve /12 Three

1.4.2(a\ (b\ (c\ uclear membrane ell membrane plasmalemma/plasma membrane

1.4.3Testes Ovaries (Mark firs t TWO only\ (1 (1\

1.5.1Dihybrid cross (1\

1.5.2(a\ (b\ Sm oth stem Elongated fruit (1\

1.5.3(a\ (b\ nn rr nrnr rrn

1.6.1Karabo (1\

1.6.2Australopith ecus africanus (1\

1.6(a\ (b\ Lee Berger Raymond

Q2— Section header —

2.1(a\ (b\ Amino acid mRNA (1\

2.1.2(a\ (b\ TAC GUA (2 (1\

2.1.3Translation Eac h tRNA carries a specific amino acid When the anticodon on the tRNA /GUA

2.2Codon GAC (on the mRNA\ changed to GAU Both these codons code for the same amino acid /Asp artic acid

2.3DNA RNA Has deoxyribose suga Has ribose sugar Has thymine

2.4.1(a\ (b\ (c\ Chromosomal mutation Non disjunctio

2.4The hromosome pair /c hromatids failed to

2.4.3 In Trisomy 21 there is an extra chromosome/three copies of chromoso me 21 in each somatic cell In Mosaic Down syndrome there is an extra chromosome only in some cells

3.1.1To de termine which blood group was the most common in their community

3.1.2(a\ (b (c\ Obtain permission from the school /clinic to conduct the investigation

3.1600 90 participants (3\

3.1(a\ (b\ (Blood group\ (Blood group\AB (1\ (1\

3.1(2\

3.2.1Artificial selection /selective breeding (1\

3.2hey ch ose dogs with desir able traits and

3.2.3Allow them to interbreed with each other and see whether they produce fertile offspring OR Analysis of DNA

3.2Rhodesian ridgeback is trong, athletic and fast

Q3— Section header —

3.2Due to reduction in gene pool variation hey will not be able to hunt /find shelter/defend themselves

3.3If a population of a single species becomes separated by a geographical barrier (sea, r iver, mountain, lake\ then the population splits into two There is now no gene flow between the two populations

3.4.1 Phylogenetic tree /cladogram (1\

3.4(a\ (b\ (1\

3.4.3(a\ (b\ Bonobo Chimpanzee (Mark first TWO only\ Orang utan Go

3.4.4Foramen magnum at more back ward position

3.5.1Modern humans originat ed in Africa and migra ted to other parts of the world

3.5.2Fossils of Ardipithecus were found in Africa only Fossils of Australopithecus

Topics Identified

Cell BiologyGenetics

Mark Allocation

Total150 marks

Sections50 = 50 marks

Paper information

SubjectLife Sciences

Year2023

SessionMay-June

TypeMemo

PaperPaper 2

LanguageEnglish

Pages11

Downloads4

Examination context

Decade2020s

Years ago3y

Season—

Start day—

Exam period—

Days since exam—

About Life Sciences examination preparation

Grade 12 Life Sciences combines biological knowledge with interpretation and scientific reasoning. Paper 1 covers molecular biology, genetics, and cell biology, while Paper 2 tests human physiology, ecology, and evolution.

Every available Grade 12 Life Sciences past paper and memorandum is collected in the Life Sciences hub at life-sciences.freemode.co.za — browse all years, sessions and languages in one place.

How to use this resource for revision

A past examination paper is most useful when it is treated as an active revision exercise. Try the questions yourself before checking the corresponding memorandum. Where you make an error, identify the reason — was it a knowledge gap, a calculation mistake, an interpretation issue, or an examination technique problem?

For stronger examination practice, complete the paper without unnecessary interruptions and keep track of the questions that take the most time. Afterwards, review the memorandum and separate knowledge gaps from mistakes caused by interpretation, calculation, structure, or examination technique.

recalling biological concepts

applying knowledge to unfamiliar situations

interpreting diagrams and information

using scientific terminology

constructing precise written responses

A practical revision approach

Life Sciences rewards exact biological terminology — examiners deduct marks for paraphrased definitions. Create a glossary of key terms and practice using them in context.

Grade 12 subject hubs

Each matric subject has its own dedicated hub on Freemode with every past paper and marking memorandum we have archived for that subject.

➗ Mathematics View papers → 📊 Mathematical Literacy View papers → ⚗️ Physical Sciences View papers → 🧬 Life Sciences 📍 You are here 📒 Accounting View papers → 💼 Business Studies View papers → 📈 Economics View papers → 🌍 Geography View papers → 🏛️ History View papers → 📖 English View papers → 🇿🇦 Afrikaans View papers → 🗣️ IsiNdebele View papers → 🗣️ IsiXhosa View papers → 🗣️ IsiZulu View papers → 🗣️ Sepedi View papers → 🗣️ Sesotho View papers → 🗣️ Setswana View papers → 🌾 Agricultural Sciences View papers →

Corresponding examination paper

Examination paper available

Open the corresponding examination paper to practise the questions before reviewing the marking memorandum on this page. Attempt every question under timed conditions for the most realistic preparation.

Life Sciences Paper 2 (English) →

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