Biology · 2000 · May · Paper 3 · HL · Question paper
BiologyQuestion paper2000HLMay
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This question paper is listed under Biology in the 2000 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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BIOLOGY
HIGHER LEVEL
PAPER 3
Friday 12 May 2000 (morning)
1 hour 15 minutes
M00/410/H(3)
INTERNATIONAL BACCALAUREATE
BACCALAURÉAT INTERNATIONAL
BACHILLERATO INTERNACIONAL
220-182 16 pages
INSTRUCTIONS TO CANDIDATES
! Write your candidate name and 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 in a continuation answer booklet, and indicate the number of booklets used in the
box below. Write your name and candidate number on the front cover of the continuation
answer booklets, and attach them to this question paper using the tag provided.
! At the end of the examination, indicate the letters of the Options answered in the boxes below.
Number
Name
TOTAL
/40
TOTAL
/40
TOTAL
/40
NUMBER OF CONTINUATION
BOOKLETS USED .........
/20/20/20
/20/20/20
IBCATEAM LEADEREXAMINEROPTIONS ANSWERED
Option D — Evolution
D1. There is evidence that humans, chimpanzees and gorillas evolved from a common ancestor.
Biologists recently selected a large number of genes at random from the human genome and
compared their base sequences with those of the same genes in chimpanzees and gorillas. The
number of base substitutions in the evolution of each species from the common ancestor was then
deduced.
Some of the base substitutions did not cause a change in the amino acid sequence encoded by the
gene. These mutations were assumed to be neutral in terms of natural selection and were used to
estimate the total mutation rate in each species.
The other base substitutions did cause a change in the amino acid sequence encoded by the gene,
each base substitution causing one amino acid substitution.
The estimated mutation rate was then used to calculate an expected number of amino acid
substitutions. The results are shown in the table below.
3.11.90.00000000123Gorilla
3.21.50.00000000122Chimpanzee
4.22.60.00000000133Human
Expected number of
amino acid substitutions
per generation
Observed number of
amino acid substitutions
per generation
Mutation rate per
nucleotide per yearSpecies
(Source: Crow, Nature (1999), 397 pages 344-347)
[2]
(a) Identify
File information
Subject
Biology
Document type
Question paper
Year
2000
Session
May
Level
HL
Paper
3
Examination zone
Not labelled in the archive
Language
Not labelled in the archive
File size
124 KB
Pages
16
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