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Biology · 2014 · May · Paper 3 · HL · TZ1 · Markscheme

BiologyMarkscheme2014HLMay

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This markscheme is listed under Biology in the 2014 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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M14/4/BIOLO/HP3/ENG/TZ1/XX/M 11 pages MARKSCHEME May 2014 BIOLOGY Higher Level Paper 3 – 2 – M14/4/BIOLO/HP3/ENG/TZ1/XX/M Option D — Evolution 1. (a) both show a (similar) range of life spans; both have a peak at 12–14 hours; SFS flies have higher mean life span than NFS flies / vice versa; (some) SFS flies live longer than 16 hours, NFS flies do not; (some) NFS flies live less than 10 hours, SFS flies do not; [3 max] (b) SFS has the drier climate as SFS flies live longer (when subjected to drought stress); both SFS and NFS have similar climates as both SFS and NFS flies have peak at 12–14 hours; [1 max] (c) NFS and SFS flies have different gene pools; abiotic differences between the two slopes create different selection pressures; genes/alleles for advantageous characteristics passed on from one generation to the next/become genetically different over time; may not mate / reproductive barriers/isolation leads to speciation; abiotic/geographical differences may not be sufficient to cause reproductive barrier; the gene pools may not be separated if flies can fly between sides of canyon/mix at base of canyon; [3 max]
File information
Subject
Biology
Document type
Markscheme
Year
2014
Session
May
Level
HL
Paper
3
Examination zone
TZ1
Language
Not labelled in the archive
File size
369 KB
Pages
11
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