life sciences Memo 2 (English)

Feb-March 2015 — Grade 12 / Matric — life sciences

Memo 2015 Grade 12 English Life Sciences Hub →

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🎯 150 marks 📄 12 pages 📝 36 items found 📚 3 topics

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1.1.10(10 x 2\ (20\

1.2.5Homolo gous Genom DNA profil inger print Albinism Peptid

1.2.10Karyot Kar ogram clear pores lon geogra (10 x (10\

1.3.3oth oth /A and B oth oth /A and B only

1.3.6oth oth /A and B None (6 x 2\ (12\

1.4.1(a\ leotid (2\ (b\ phosphate ion Deo xyribose (2\ (c\

1.4.3leus Inter ase (1\ (1\ (8\ TOTAL SECTION

2.1.1(1\

2.1.2(a\ (b\ (2\ (2\

2.1.3Since the allele is found only on the X chromosome A male only has one allele that is either dominant (normal\ or recessive (colour blind\ and therefore will always

2.1.4(2\ (11\

2.2.1Andrew h as short fingers while Susan has normal fingers Andrew h as straight hair while Susan has curly hair (2\

2.2.2, bh (2\

2.3.1(a\ (b\ of I (2\ (1\

2.3The baby inherited one allele for type O blo d/i from each parent since r genot is

2.3.3Blo od type can be used to exclude a particular man as parent but it cannot confirm tha a particular man is the father Since a large portion of the population have the same blood type Any

2.3.4Normal females have two chromosome Normal males have one The female always provides X in the egg

2.4.1To prevent the flowers in Population 1 from self pollinati To ensure cross pollination between the flowers

2.4.2produced did not germinate (1\

2.4.3ype of soil Amount of water Temperatur Exposure to sunlight Depth of sowing in soil rk first TWO only\ (Any 2\ (2\

2.4.4Repeat the investigation Increase the sample size number of seeds number of plots number of plant rk first ONE only\

2.5A population of a particular species may split into two populations because of a geographic barrier There will be no gene flow between the two separated populations Due to the difference in environmental conditions

1.8<25 25-29 30-34 35-39 Incidence of Down syndrome (per 1 000 births\ The incidence of Down syndrome as a result of errors in meiosis II at different maternal ages 1,9

3.1.1riteri Elaboration Mark of gra Histogram is drawn of Meios Caption

3.1.3disjunction Meios (1\ (1\

3.1.4Number of Do ndrom e babies x 44 10,71 /11 ies (3\

3.2.1DNA carries hereditary i formation DNA contains coded information for protein synthesis first E only Any

3.2.3ACA reonin ste ust be in correct order (1\ (2\

3.2.4oth ATG ATA the same amino acid/tyrosine (2\

3.2.5The anti odon o n the tRNA matches the codon on the mRNA tRNA bring s the required amino acid

3.3.1phenotype red yellow X red yellow genotype RY X RY Meiosis /gametes R, Y X R, Y Fertilisation genotype RR, RY, RY, YY

3.3.3/half A tree with red apples should be crossed with a tree that produces yellow apples (1\ (2\ (9\ Gametes

3.4.1A. anamensis A. afarensis rk first TWO only (2\

3.4.3(4,5mya 3mya\ = 1,5 mya The cranium increased in size so it could accommodate a larger brain

3.4.4Smaller teeth /canines in Homo spe ies, can chew food that was cooked

4.1Evolution according to Lamarck Lamarck explained evolution using the following two 'laws': The law of use and disuse As an organism uses a structure or organ more regularly , it becomes better developed or enlarged

Multiple Choice Options

A)anamensis

A)afarensis

Topics Identified

Cell BiologyGeneticsEvolution

Mark Allocation

Total150 marks

Sections40 + 40 = 80 marks

Paper information

Subjectlife sciences

Year2015

SessionFeb-March

TypeMemo

PaperPaper 2

LanguageEnglish

Pages12

Downloads6

Examination context

Decade2010s

Years ago11y

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

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life sciences Paper 2 (English) →

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