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Question 18M.3.HL.TZ1.12b

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Date May 2018 Marks available [Maximum mark: 3] Reference code 18M.3.HL.TZ1.12b
Level HL Paper 3 Time zone TZ1
Command term Describe Question number b Adapted from N/A
b.
[Maximum mark: 3]
18M.3.HL.TZ1.12b
(b)

Describe how BLAST can be used to establish phylogenetic relationships between several organisms.

[3]

Markscheme

a. results from BLASTn or BLASTp /genomic or proteomic sequences can be used 

b. compared with data from available organisms 

c. matches based on the number of similarities in the sequence are identified 

d. similarities in sequence may be caused by evolution or by chance 

e. computer programs (use sequence alignments) to suggest evolutionary relationships / cladograms can be constructed

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