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Biology · 2000 · November · Paper 3 · HL · Markscheme

BiologyMarkscheme2000HLNovember

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This markscheme is listed under Biology in the 2000 examination archive. Its catalogue level is HL. The catalogue session is November. 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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MARKSCHEME November 2000 BIOLOGY Higher Level Paper 3 N00/410/H(3)M INTERNATIONAL BACCALAUREATE BACCALAURÉAT INTERNATIONAL BACHILLERATO INTERNACIONAL 11 pages Option D — Evolution D1. (a) two forms of transferrin; [1] [2] (b) (i) no cheetahs were heterozygous / all cheetahs were homozygous and most / thirteen domestic cats were; because all tracks for cheetahs show one band and some domestic cat tracks show two; (ii) one allele in cheetahs as only one band; three / four alleles in domestic cats as bands at three / four levels; [2] (c) low levels of variation / few alleles in the gene pool; low potential for evolution because variation is needed; [2] D2. (Any three from the following) spine enters the skull from underneath / the foramen magnum is on the base of the skull; the occipital condyls are far forwards / the head is held vertically; base of vertebral column is curved backwards in the small of the back / there is a lumbar curve; there is a reduced lower back; femur joint is stronger and it is angled inwards at the joint with the hip / pelvis; leg / hind limb is proportionally longer
File information
Subject
Biology
Document type
Markscheme
Year
2000
Session
November
Level
HL
Paper
3
Examination zone
Not labelled in the archive
Language
Not labelled in the archive
File size
20 KB
Pages
7
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