Life Sciences Paper 2 (English)

November 2016 — Grade 12 / Matric — Life Sciences

Past Paper 2016 Grade 12 English Life Sciences Hub →

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🎯 150 marks 📄 18 pages 📝 55 items found 📚 4 topics 🔑 1 key info

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Q1— Section header —

1.1Various options are provided as possible answers to the following questions. Write down the question number (1. 1 to 1 .9\, choose the answer and make a cross (X\ over the letter (A to D\ of your choice in the ANSWER

1.110

1.1The theory of evolution by natural selection was first described by Gregor Mendel Watson and Crick Jean Baptiste de Lamarck Charles Darwin

1.1.2When an individual that is homozygous dominant for a particular characteristic is crossed with an individual that is homozygous recessive for the characteristic, all the offspring would be omozygous dominant

1.1The absence of the protein melanin results in the disorder called aemophilia olour blindness

1.1A hummingbird uses its long beak to feed the nectar in flowers. The reason that Lamarck would have provided for the long beak of the hummingbird is that ll hummingbirds have the same beak length

1.1ARE BA SED ON THE DIAGRAM BELOW SHOWING THE RESULTS OF A PARTICULAR PROCEDURE

1.1The procedure shown above is called cloning. DNA replication DNA profiling. ingerprinting

1.1The evidence in the diagram shows that only Tom was present at the scene of the crime Tom and

1.1Below is a list of possible uses of the procedure shown in the diagram above (i\ Paternity testing (ii\ Matching of tissues for organ transplants (iii\ Identification from fingerprints

1.1Which statement is a valid conclusion that can be drawn from this graph Species is most closely related to species species species species

1.1The percentage DNA similarities between species could be used to show the following (i\ Similarities in protein synthesis (ii\ Evidence for evolution

1.2Give the correct biological term for each of the following descriptions. Write only the term next to the question number (1.2.1 to

1.2in the ANSWER BOOK

1.2.7The organelle in the cytoplasm which is the site of protein synthesis The name of the bond that form between amino acids in a protein molecule The p

1.3Indicat e whether each of the descriptions in COLUMN I applies to A ONLY B ONLY BOTH A AND B or NONE

1.3.1The selection and breeding of organisms with desirable characteristics by humans Natural selection Artificial selection

1.3.2An allele that is not shown/expressed in the phenotype when found in the heterozygous condition Dominant Recessive

1.3.3Pairing of nitrogenous bases

1.5The diagram below represents a process that occurs during meiosis.

1.5.1Provide labels for: (a\ (b\ (c\ (1\ (1\ (1\

1.5.2Give the function of the structure labelled (1\

1.5.3Name: (a\ (b\ The process occurring at The phase in meiosis during which the process occurs (1\ (1\

1.5.4State ONE reason why process significant (1\ (7\

1.6.3When did Paleotherium beco me extinct How long did it take for the modern horse to evolve from Hyracotherium (6\

Q2— Section header —

2.1The leaf colour in a plant is controlled by two alleles, green ( \ and yellow Thorns on plant stems are controlled by two alleles presence of thorns ( and no thorns ( wo

2.1.1Give the: (a\ (b\ enotype of (i\ henotype of (ii\ (1\ (2\

2.1.2List the FOUR genotypes of the offspring of the second generation that would be phenotypically different from the original pair of parents. (4\ (7\ Gametes (i\ (ii\

2.2.1Explain why cell does NOT belong to a human

2.2How many chromosomes would be present in (a\ (b\ ell at the end of telophase daughter cells produced by cell after meiosis (1\

2.2Draw a labelled diagram of gamete that will result from cell

2.3State Mendel s law of segregation (3\ Cell 2 Cell 3 Cell 1 12

2.4What is: (a\ (b\ Susan s phenotype Sarah s genotype (1\ (1\

2.4Emma plans to have a baby What must the father genotype be so that there is a 50% chance that their child

2.4Exp

Q2— Section header —

2.5.1Name the process represented in the diagram (1\

2.5.2Where in the cell does this process occur? (1\

2.5.3Give the: (a\ (b\ Complementary bases on DNA strand for CAG triplet Sequence of bases at

2.5Which amino acid will occur more than 35 times in a Huntington protein

2.5Explain how a mutation results in the formation of a different protein strand 1 strand 2 mRNA 14

Q3— Section header —

3.1Read the passage below. GENETIC MODIFICATION OF CROPS Genetic modification (GM\ of crops began with the discovery that the soil bacterium Agrobacterium could be used to transfer useful genes from unrelated species into plants.

3.1.3According to the passage how did genetic modification of crops begin? Explain why a plant, which is modified to be weed killer resistant, could be a problem for farmers. Give TWO

3.2Lizards of a certain species on an island are usually brown in colour. A mutation in one gene for body colour results in red or black lizards. Black lizards camouflage well against the dark rocks and warm up faster on

3.2.6State the: (1\ (1\ (2\ (2\ (2\ (6\ (6\

3.3The diagram below shows the distribution of members of the camel family the different continents. The arrows indicate the current distribution of the animals. [Adapted from http://www.ck12.org

3.4Human b lood groups are controlled by multiple alleles

3.4.3Name ALL the alleles that control human blood group How many of the alleles named

Q3— Section header —

3.4.4A man has blood group and his wife has blood group . Their first child has blood group and the second child has blood group What can one conclude about the blood groups of their future

Q4— Section header —

Topics Identified

Cell BiologyGeneticsEvolutionEcology

Mark Allocation

Total150 marks

Sections40 + 40 = 80 marks

Key Information

Websitewww.shutterstock.com · www.ck12.org

Paper information

SubjectLife Sciences

Year2016

SessionNovember

TypePast Paper

PaperPaper 2

LanguageEnglish

Pages18

Downloads7

Examination context

Decade2010s

Years ago10y

SeasonSpring (SH)

Start daySaturday

Exam periodNovember 2016

Days since exam3,641

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 marking memorandum

Marking memorandum available

Use the corresponding memorandum after completing the paper to review your answers and identify areas that require further revision. The memorandum shows the marking approach used by DBE examiners, including method-mark allocations.

Life Sciences Memo 2 (English) →

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