life sciences Paper 2 (English)

Exemplars 2014 — Grade 12 / Matric — life sciences

Past Paper 2014 Grade 12 English Life Sciences Hub →

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Q1— Section header —

1.1Various options are provided as possible answers to the following questions. Choose the correct answer and write only the letter (A to D\

1.110 \in the ANSWER BOOK , for example

1.1.1D.

1.1.1Which ONE of the following serves as evidence of cultural evolution in early Homo species?

1.1.2A father has blood type A. He has 4 children with the following blood types: Child Child

1.1.3New alleles arise in a sexually reproducing population through ... mutations in DNA sequences prior to meiosis. random fertilisation of gametes during reproduction. random assortment of homologous chromosomes during

1.1.4tall pea plant was crossed repeatedly with a short pea plant. In each of these crosses, they produced only tall offspring. It is reasonable to conclude that the

1.1.5The table below shows a section of the mitochondrial DNA (mtDNA \sequence for a modern human, a chimpanzee and three hominid species. The letter

1.1.6The following data represents a small section of a sequence of nucleic acid bases taken from an animal cell A G C U C G U U Life Sciences/P2 DBE/2014 NSC Grade 12 Exemplar

1.1.7The list below provides information relating to the replication of DNA 1. Complementary nucleotides bind to each of the two strands 2.

1.1.8Which ONE of the following accounts for gametes having a single allele only for a particular characteristic, instead of two?

1.1.9more than one gene controls a trait or characteristic. there are more than two different alleles for the same gene. the different alleles for the same characteristic are at different

1.1.10In a situation where a characteristic is expressed more frequently in males than in females in humans, we can conclude that one allele is dominant over the other. the alleles for the characteristic are located on the

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

1.2.6An allele that does not influence the phenotype when found in the heterozygous condition The position of a gene on a chromosome The physical and functional expression of a gene Chromosomes that are not responsible for

1.3Indicate whether each of the statements in COLUMN I applies to A only only both A and

1.3the ANSWER BOOK COLUMN I COLUMN II

1.3.1Discovered the double helical structure of DNA Francis Crick James Watson

1.3.2Describes evolution as consisting of long phases of little change alternating with short phases of rapid change punctuated equilibrium arwinism

1.3.3Variation within a population in which there is a range of intermediate phenotypes discontinuous variation continuous variation

1.3.4Evidence for evolution mitochondrial DNA cladogram

1.3.5Chromosome condition of a cell that has a single set of chromosomes diploid haploid

1.3.6Two alleles of a gene that are equally dominant codominance complete dominance

1.3.7The full complement of genes present in an organism karyotype phenotype

1.3.8Bonds that hold amino acids together in a protein molecule hydrogen bonds peptide bonds

1.4In pea plants the allele for round seeds (R\is dominant over the allele for wrinkled seeds (r\The allele for yellow seeds (Y\is dominant over the allele for green seeds (y\ Plant A, heterozygous for both seed shape and seed colour, was crossed with

1.4.4Write down the genotype of: (a\Plant A (b\Plant B Write down ALL the possible genotypes of the gametes of plant A. State the phenotype of an offspring having the genotype:

Q2— Section header —

2.1The diagram below shows the process of protein synthesis.

2.1.1Identify the following: (a\ (b\ Molecule Organelle (1\ (1\

2.1.2Identify the nitrogenous base labelled: (a\ (b\ (1\ (1\

2.1.4Describe the role of DNA during transcription. Describe the part of protein synthesis shown as process which occurs at organelle

2.1.5The table below shows the amino acids that correspond with different DNA codes. Write down the correct sequence of amino acid coded for by structure

2.2The phylogenetic tree below shows one interpretation of the origin of humans. The dotted lines indicate the possible evolutionary relationships, and the vertical bars show the period during which the organisms are believed to have

2.2.2Use the diagram to identify ONE organism that may have competed with Homo heidelbergensis for resources. Identify the common ancestor that gave rise to both Paranthropus and Homo

2.2.3(a\ (b\ For what period of time did africanus exist on Earth? Show all working.

Q2— Section header —

2.2.4(a\ (b\ Which organism, ergaster or

Q2— Section header —

2.3The diagram below shows the result of abnormal meiosis, starting with a cell showing chromosome pair 21.

2.3.4Explain the number of chromosomes present in sperm and sperm How many copies of chromosome 21 would you expect in a normal gamete?

2.4Study the diagrams below showing structures of different organisms.

2.4.2Which diagram represents a structure that is analogous to the structure in Diagram 4? Write down the number of any TWO diagrams that represent homologous structures. (1\ (2\

2.4.3What information do analogous and homologous structures provide about evolution? (2\ (5\ [40] Human limb Butterfly wing Bat wing40

Q3— Section header —

3.1Scientists investigated the resistance of mosquitos to DDT. The following steps were followed They captured a sample of mosquitos from the environment The mosquitos were then exposed to a standard dose of DDT

3.1.6Identify the: (a\ Independent variable (b\ Dependent variable Formulate a hypothesis for this investigation Draw a line graph to show how the mortality of mosquitoes

3.2Study the table below, which indicates some of the hominid fossils found in different parts of the world. SPECIES AREA WHERE IT WAS FOUND PERIOD OF EXISTENCE

3.2.2Explain why the information in the table supports the 'Out of Africa' hypothesis. Describe how the analysis of mitochondrial DNA is used to support the 'Out of Africa' hypothesis. (2\ (3\ (5\

3.3The pedigree diagram below shows the inheritance of Daltonism in a family. Daltonism (red green colour blindness\is sex linked. The allele for Daltonism is recessive to the allele for normal

3.3.1Use the symbols X , X and Y to state the genotype of the following: (a\ (b\ Individual

3.3.3How many family members not affected by Daltonism are definitely carriers? Use a genetic cross to determine the possible genotypes and phenotypes of the offspring that may be formed by individuals and

Q4— Section header —

Topics Identified

Cell BiologyGeneticsEvolution

Mark Allocation

Total150 marks

Sections40 + 40 = 80 marks

Paper information

Subjectlife sciences

Year2014

SessionExemplars

TypePast Paper

PaperPaper 2

LanguageEnglish

Pages14

Downloads5

Examination context

Decade2010s

Years ago12y

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

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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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