Life Sciences Memo 1 (English)

Feb-March 2013 — Grade 12 / Matric — Life Sciences

Memo 2013 Grade 12 English Life Sciences Hub →

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🎯 150 marks 📄 10 pages 📝 28 items found 📚 2 topics

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Q1— Section header —

1.1.10x 2\

1.2.1Biogeography

1.2.2Extinction

1.2.3Chiasma

1.2.4Translation

1.2.5Polygenic

1.2.6Haemophilia

1.2.7Locus

1.3.8Both A and B B only B only Both A and B Both A and B Both A and B Both A and B B only x 2\

Q2— Section header —

2.1.1(a\ deoxyribose sugar (b\ phosphate group (1\

2.1.2(a\ Guanine (b\ Guanine (1\ (1\

2.1.3The formed complemen tary strand contain thymine not uracil Both strands of DNA molecule are being used as a template Any (6\

2.2.1/parent phenotype affected female x unaffected male genotype X Meiosis /gametes Fertilisation /offspring genotype Y, X phenotype 1 affected

2.2.3It is caused by a dominant allele carried on the X chromosome which both male and female have

2.2.4(a\ Point mutation (b\ A different amino acid w ould coded for resul ting in a

2.2.5o determine the chances of having a child with the disorder Help them evaluate whether they would cope with such a child Help them make an informed decision on whether to have children Mark first TWO only

2.3.2Met Met\ (Arg Arg Arg\ Asn (3\

2.4Diagram A Crossing over took place / there was exchange of genetic material/ there was random assortment of chromosomes Any It increases genetic variation Reduces the number of chromosomes

Q3— Section header —

3.1.3Projecting nose Smaller canines Bipedal (Mark f irst THREE only\ They had a wider view to spot danger They could carry offspring /food/tools

3.3.2The oldest fossils of hominids Australopithec ines and Homo habilis are only found in Africa whilst the younger fossils are found worldwide which suggests

3.4Finch population had variation / different beak sizes * The population was separated by a geographical /physical barrier * Allopatric speciation took place As the se parate

Q4— Section header —

4.1Earlobe Tongue Little finger Dominant Recessive Rubric for the mark allocation of the graph Correct type of graph Caption for graph Correct label for X

4.1.6These traits are inherited and not influenced by age d a large sample size Get permission from the principal/authorities to conduct the investigation Decide on the appropriate time/day to conduct the investigation

4.2.4/ heterozygous / homozygous dominant (1\ (1\ (1\ (1\ (4\ es

Topics Identified

GeneticsEvolution

Mark Allocation

Total150 marks

Sections30 = 30 marks

Paper information

SubjectLife Sciences

Year2013

SessionFeb-March

TypeMemo

PaperPaper 1

LanguageEnglish

Pages10

Downloads3

Examination context

Decade2010s

Years ago13y

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 1 (English) →

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