Life Sciences Paper 1 Version 1 (English)

November 2011 — Grade 12 / Matric — Life Sciences

Past Paper 2011 Grade 12 English Life Sciences Hub →

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🎯 150 marks 📄 14 pages 📝 58 items found 📚 2 topics 🔑 1 key info

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Q1— Section header —

1.1example 1.1.6 D. called ...

1.1.1The particular position of a gene on a chromosome is an allele.

1.1.2Which of the following statem ents are characteristic of DNA? (i\helix (ii\Sugar molecule is ribose (iii\Found in the nucleus (iv\Constant amount normally found in all the somatic cells of a particular species

1.1.3Menstruation starts when the production of ... oestrogen and progesterone decreases.

1.1.4The difference between nucle ic acids and nucleotides is nucleic acids are building blocks of nucleotides. nucleotides are larger than nucleic acids. nucleic acids are found in t he nucleus and nucleotides

1.2.7contrasting characteristics are studied the pigment melanin The period from fertilisation to birth moving it into the ce

1.3Indicate A ONLY ONLY

1.1.5Which ONE of t identical twins is CORRECT? They are formed from a single fe rtilised ovum that splits into

1.2Give the correct biological term for each of the followin g descriptions. Write only the term next to the question number (1.2.1 to 1.2.7\ER

1.2.1The genetic crossing of two or ganisms in which two pairs of The structure containing enzymes at the tip of a sperm cell that makes contact with the egg cell during fertilisation A genetic disorder in which the

1.3.1Changes in the struct B Mutation

1.3.2Method of contrac eption A The pill

1.3.3Red flowering pl ants crossed with white B Incomplete

1.3.4Receives pollen grains A Stigma

1.3.5The duct/tube carrying A Epididymis

1.3.6Stimulates the fo follicle B Oestrogen (6 x 2\

1.4.4which the phases occur. (3) (4) (14)14

1.4.1Give the names respectively. (5\

1.4.2Identify the phase represented in:

1.4.3Write down the numbers of the diagr ams in the correct sequence in Explain TWO ways in which meiosis is important.

1.4The diagrams below show cells dividing during meiosis. (1\ 23 and sperm cells. 22 + X 22 + X

1.5.3Write down the letters (a) (b) Write down the letters (c) child that completes the table above. probability of her fourth child bein

Q2— Section header —

2.1mitosis and meiosis. The results are given in the table below. DNA CONTENT (ARBITRARY UNITS) Mitosis Prophase 8

2.1.2Early interphase and prophase of mitosis Early prophase of meiosis I and late prophase of meiosis II (2) (2) (4)4

1.5The table below shows the autosom es and sex chromo somes of human egg EGG (23\SPERM (23\ZYGOTE (46\SEX OF CHILD

1.5.1and and next to each the autosomes and sex chromosomes that complete the table above. and (d\ and next to each the sex of the A woman has three child ren, all of whom ar e boys. What is the

2.1.1TOTAL SECTION A:

2.2blood groups in a sm all human population.

2.2.5investigated? compared to blood group in this portion of a human population? Which allele is the least frequent in this population?

Q2— Section header —

2.2.1Which blood group has the lowe st frequency in the population How many times more often woul d you find people with blood group Frequency of each blood group in a small population

2.3.4Label structures and respectively.

2.3Study the diagram below and ans

2.4.6investigation. this investigation. graph? which you would ensure

2.4.1Formulate a possible hypothesis for this investigation. Name ONE factor that was varied by the scientists in this How many different values of t

Q2— Section header —

2.4An investigation to det ermine the effect of incr (deadly\hromosomes in fruit flies was undertaken by The effect of increasing radiation on lethal mutations on X chromosomes 010002000300040005000 Amount of X-rays (arbitrary units\

Q3— Section header —

3.1below showing the ge rabbits. RABBIT 1 2 3 4 GENOTYPE

3.1.4and , respectively? State the genotypic ratio that is shown in the table above. If rabbits

3.1.1What are the phenotypes for rabbits and mated and had 18 offspri ng, how many of these Represent a genetic cross to s how the possible phenotypes and

3.2the placenta and its attach ment to the foetus.

3.2.6Label structures and respectively. Name:

Q3— Section header —

3.3.1gender and the incidence of haemophilia. (2) possible genotypes of:

3.3Study the pedigree diagr am of a family where some individuals have haemophilia. Haemophilia is a sex-linked disorder. Use for normal blood Key From the pedigree diagram above, st ate the relationship between

3.3.2Write down ALL the TOTAL SECTION B:60 Normal female Normal male SECTION C

Q4— Section header —

4.1.5second donor before the sheep could be cloned? sheep?

Q4— Section header —

4.1.1Why was it necessary to remove the nucleus from the egg cell of the Will Dolly have the characteristi cs of the first or second donor Number 5 in the diagram states t hat 'the embryo is cultured'. Through which type of cell division does the embryo develop?

4.1Study the diagram below that show s the cloning of a sheep named Dolly. 1. A body cell is 2. The body cell nucleus the egg cell of the second 4. The body cell nucleus is inserted into the egg cell 5. The embryo is

4.2.2compare male and female foetal length over time. State TWO conclusions from the results shown in the graphs. (11) (2) (13)13

4.2The following table shows the aver age human foetal l ength of males and FOETAL LENGTH MALE FEMALE 8 1 1 13 7 7 16 14 13 24 33 31 36 46 43

4.2.1Draw TWO sets of bar graphs on the same system of axes to

4.3Gonorrhoea and HIV/Aids are common sexually transmitted diseases (STDs\ which infect a relatively high percent age of young sexual ly-active people Write a mini-essay in which you stat e the causes, THREE symptoms and the

Topics Identified

Cell BiologyGenetics

Mark Allocation

Total150 marks

Sections30 + 30 = 60 marks

Per-question sum262 marks

Key Information

Contact Number0100020003 · 0004000500

Paper information

SubjectLife Sciences

Year2011

SessionNovember

TypePast Paper

PaperPaper 1

LanguageEnglish

Pages14

Downloads8

Examination context

Decade2010s

Years ago15y

SeasonSpring (SH)

Start daySaturday

Exam periodNovember 2011

Days since exam5,470

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 1 Version 1 (English) →

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