YEAR 2003
Section A
1.
Figure 4 shows various type of fingerprints.
shown below.
Student X :- Whorl
Student Y :- Composite [2 marks]
(ii) State one factor that causes variation
between the fingerprints of students X and Y.
Genetic factor
[1 mark]
(iii)
State how the factor in (a)(ii)
causes variation.
Crossing over, independent assortment, and random fertilisation
between gametes
[1 mark]
(b)(i) What is the type of variation shown in Figure
4?
[1 mark]
(ii) State
two traits other than fingerprints that shows the same type of variation as
mentioned in (b)(i).
Eye colour / Ear lobe shape/ Tongue-rolling / Thumb
hyperextension /
Hair colour / Sex / Blood group / Hair type ~ Any 2
[2 marks]
(c) An identity cards bears both the
fingerprint and the photograph of the
individual. Explain why the use of such
identity card is a more effective
method of identification than a card with
only the fingerprint or the photograph.
Only one evidence (either finger print or photograph) is not enough to identify a
person. A few evidences are
needed to confirm the identification of a person so that no mistake will occur. The finger print of an individual will not
change but a photograph can change.
[3 marks]
(d) Figure 5 shows the graphs of two type of
variation in a group of students.
Describe
the differences between the two types of variation
- Body mass shows a
continuous variation whereas types of fingerprints shows
a discontinuous variation
- Difference in
body mass is not distinct whereas difference in the types of fingerprints is
very distinct.
- The graph of
body mass is a normal distribution
whereas the graph of the types of fingerprints is a
discrete distribution
[2 mark]
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