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NATIONAL
SENIOR CERTIFICATE

GRADE 12

LIFE SCIENCES P2
FEBRUARY/MARCH 2015
MEMORANDUM

MARKS: 150

This memorandum consists of 12 pages
...
–Mar
...


If more information than marks allocated is given
Stop marking when maximum marks is reached and put a wavy line and 'max' in
the right hand margin
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If, for example, three reasons are required and five are given
Mark the first three irrespective of whether all or some are correct/incorrect
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If whole process is given when only a part of it is required
Read all and credit the relevant part
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If comparisons are asked for but descriptions are given
Accept if the differences / similarities are clear
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If tabulation is required but paragraphs are given
Candidates will lose marks for not tabulating
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If diagrams are given with annotations when descriptions are required
Candidates will lose marks
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If flow charts are given instead of descriptions
Candidates will lose marks
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If sequence is muddled and links do not make sense
Where sequence and links are correct, credit
...
If sequence and links becomes correct again, resume
credit
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Non-recognized abbreviations
Accept if first defined in the answer
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10
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11
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12
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13
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Copyright reserved

Please turn over

Life Sciences/P2

3
NSC – Memorandum

DBE/Feb
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2015

14
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15
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Memorandum will allocate marks for units separately
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Be sensitive to the sense of an answer, which may be stated in a different
way
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Caption
All illustrations (diagrams, graphs, tables, etc
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18
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A marker that is proficient in the relevant official language
should be consulted
...


19
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20
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Copyright reserved

Please turn over

Life Sciences/P2

4
NSC – Memorandum

DBE/Feb
...
2015

SECTION A
QUESTION 1
1
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2

1
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4

1
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1
1
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2
1
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3
1
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4
1
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5
1
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6
1
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7
1
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8
1
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9
1
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10

D
B
B
D
A
C
B
A
A
D

(10 x 2)

(20)

1
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1
1
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2
1
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3
1
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4
1
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5
1
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6
1
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7
1
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8
1
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9
1
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10

Homologous
Genome
DNA profile/fingerprint
Albinism
Peptide bonds
Karyotype /Karyogram
Nuclear pores
Clone
Hypothesis
Biogeography

(10 x 1)

(10)

1
...
1
1
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2
1
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3
1
...
4
1
...
5
1
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6

Both A and B /Both/A and B
Both A and B /Both/A and B
A only
B only
Both A and B /Both/A and B
None

(6 x 2)

(12)

1
...
1

(a) W – Nucleotide
U – DNA

(2)

(b) X – Phosphate/phosphate ion
Y – Deoxyribosesugar

(2)

(c) Z – Hydrogen bond

(1)

(d) V – Adenine

(1)

1
...
2

Nucleus 

(1)

1
...
3

Interphase 

(1)
(8)
TOTAL SECTION A:

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50

Life Sciences/P2

5
NSC – Memorandum

DBE/Feb
...
2015

SECTION B
QUESTION 2
2
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2

2
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1
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1
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1
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1
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2
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2
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3
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3
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3
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3
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4

2
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1

6
NSC – Memorandum

-

2
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4
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4
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4
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–Mar
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Even if the two populations mixed at a later stage, they will
not be able to interbreed again resulting in a new species
(Any 6)

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(2)

(1)
(6)

(6)
[40]

Life Sciences/P2

7
NSC – Memorandum

DBE/Feb
...
2015

QUESTION 3
3
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1
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8

T

1,9

Incidence of Down syndrome
(per 1 000 births)

1,6
1
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4
1,2
1
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8
0,8

0
...
4
0,4
0
...


Copyright reserved

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Life Sciences/P2

8
NSC – Memorandum

3
...
2

Non-disjunction

(1)

3
...
3

Meiosis I

(1)

3
...
4

Number of Down syndrome babies = 7,8x 44
= 10,71/11 babies

3
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–Mar
...
2
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2
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2
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2
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2
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3

3
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1

9
NSC – Memorandum

P1

phenotype
genotype

DBE/Feb
...
2015

red-yellow X
RY
X

Meiosis
G/gametes

R, Y

red-yellow
RY

X

R, Y

Fertilisation
F 1 genotype

RR,
phenotype

RY,

RY,

red
red-yellow
apples apples

YY
yellow
apples

P 1 and F 1 
Meiosis and fertilisation

(Any 6)
OR

P1

phenotype
genotype

red-yellow
RY

X
X

red-yellow
RY

Meiosis
Fertilisation

Gametes
R
Y

R
RR
RY

Y
RY
YY

1 mark for correct gametes
1 mark for correct genotypes

F1

genotype

RR,

phenotype

red
red-yellow
apples apples

P 1 and F 1 
Meiosis and fertilisation

RY,

RY,

YY
yellow
apples

(Any 6)

3
...
2

50%/half

3
...
3

A tree with red apples should be crossed with a tree that
produces yellow apples

Copyright reserved

(6)
(1)

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(2)
(9)

Life Sciences/P2

3
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–Mar
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anamensis and A
...
4
...
4
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4
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4
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TOTAL SECTION B:

Copyright reserved

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(2)
(9)
[40]
80

Life Sciences/P2

11
NSC – Memorandum

DBE/Feb
...
2015

SECTION C
QUESTION 4
4
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- If an organism does not use a structure or organ frequently, it becomes
less developed or reduced in size and may disappear altogether in that
organism
The inheritance of acquired characteristics: 
- Characteristics developed during the life of an individual
- (Acquired characteristics) can be passed on to their offspring
...
–Mar
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Only
information relating to
the theories of Lamarck
and/or Darwin and/or
Punctuated Equilibrium
is/are given
...

1
L

Comprehensive (C)
All aspects required by
the essay have been
sufficiently addressed
At least three points
included on each of the
3 theories:
Lamarck,
Darwin and
Punctuated Equilibrium

1
C
TOTAL SECTION C:
GRAND TOTAL:

Copyright reserved

20
150



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