Biology · 2006 · May · Paper 3 · HL · TZ2 · Question paper
BiologyQuestion paper2006HLMay
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This question paper is listed under Biology in the 2006 examination archive. Its catalogue level is HL. The catalogue session is May. The information below helps you identify the document before opening the complete PDF. Subject, year and session labels come from the archive catalogue; the original cover remains the reference if a label differs. A file is not automatically suitable for your current syllabus simply because its subject name matches.
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2206-6015 20 pages
M06/4/BIOLO/HP3/ENG/TZ2/XX+
Friday 5 May 2006 (morning)
biology
higher level
PaPer 3
IB DIPLOMA PROGRAMME
PROGRAMME DU DIPLÔME DU BI
PROGRAMA DEL DIPLOMA DEL BI
INSTRUCTIONS TO CANDIDATES
• Write your session number in the boxes above.
• Do not open this examination paper until instructed to do so.
• Answer all of the questions from two of the Options in the spaces provided. You may continue
your answers on answer sheets. Write your session number on each answer sheet, and attach them
to this examination paper and your cover sheet using the tag provided.
• At the end of the examination, indicate the letters of the Options answered in the candidate box
on your cover sheet and indicate the number of answer sheets used in the appropriate box on your
cover sheet.
1 hour 15 minutes
[Personal identifier removed]
[Personal identifier removed]
0120
2206-6015
– 2 – M06/4/BIOLO/HP3/ENG/TZ2/XX+
option D — evolution
D1. Many organisms use pheromones (chemical signals) to communicate with each other. These
pheromones are unique mixtures of chemicals that are typically species-specific. The way in which
different species’ pheromones have evolved has caused debate among investigators. Some
scientists believe that gradual evolution (gradualism) of pheromones has occurred while others
believe that pheromone evolution occurs through sudden major shifts (punctuated equilibrium).
The pheromone components of 34 species of bark beetle from three genera, Dendroctonus, Ips
and Orthotomicus were analysed. The data below compares the distribution of pheromone
components to an established phylogeny for three genera.
Phylogeny of three genera of bark beetle
D. adjunctus
D. brevicomis
D. frontalis
D.vitei*
D. jefferyi
D. ponderosae*
D. terebrans
D. valens
D. pseudotsugae*
D. simplex
D. rufipennis*
I. mexicanus
I. erosus
I. mannsfeldi
O. caelatus
I. latidens
I. sexdentatus
I. knausi
I. acuminatus
I. integer
I. avulsus
I. pini*
I. bonanseai
I. duplicatus
I. cembrae*
I. amitinus
I. typographus*
I. schmutzentzenhoferi
I. perturbatus
I. tridens
I. calligraphus
I. cribricollis
I.grandicollis
I.paraconfusus
Pheromone component
frontalin
exo-brevicomin
File information
Subject
Biology
Document type
Question paper
Year
2006
Session
May
Level
HL
Paper
3
Examination zone
TZ2
Language
Not labelled in the archive
File size
308 KB
Pages
20
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