Q43 - A Global Haplotype Network Traces Human and Denisovan Ancestry

Theoretical A Real exam question - full text reproduced under IBO's CC BY-NC-SA 4.0 license

Human Evolution & Hominid Phylogeny Molecular Systematics

A haplotype network shows the evolutionary relatedness of haplotypes, and the proportion of individuals from a specific population with each haplotype. The 1000 genomes project, coordinated by the European Bioinformatics Institute in England, allows a global human haplotype network to be produced. The circles represent one haplotype, each from the same locus. The colours represent different populations by geographic location. The lines represent an evolutionary link between two haplotypes. Denisovans are a non-human subspecies of the genus Homo. Tibetans are an Asian population, closely related to their neighbours across most of their genome.

Figure for Q43: A Global Haplotype Network Traces Human and Denisovan Ancestry

Using the information and data, determine which of the statements are true or which are false.

A. The British are more related to the Finnish than the British are to Yorubians at this locus.

B. Tibetans have a higher genetic diversity than Han Chinese at this locus.

C. The Yorubian people are found in Africa.

D. Tibetan ancestors interbred with Denisovans after leaving Africa.

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Question reproduced from IBO 2017, Theoretical Exam A, licensed under CC BY-NC-SA 4.0 - attributed to the International Biology Olympiad. Open the full exam PDF · Official answer key & worked solutions