How many orthologs does gene one have

Reference no: EM133477123

Problem

Six opsin genes are determined, two from each of the three species. The genes are named 1, 2, 3, 4, 5, and 6. The three species are named A, B, and C. You do not know the relationships among the three species,.

Using maximum likelihood, you are able to determine reliably the relationships among the genes. You also know which species each gene was isolated from. Your gene tree (labeled with gene number and species letter) is:

(((1A, 2B), 3C), ((4A, 5C), 6B))

Assume the following. 1) Genes 4 5 and 6 are orthologs. 2) The gene tree you estimated represents the true history of the genes. 3) The minimum number of duplication and loss events occurred during the history of this gene family.

Given the above assumptions, how many speciation events are required to explain the species tree?

Which gene (1,2,3,4,5, or 6) has no ortholog in the gene tree?

Given the above assumptions, how many orthologs does gene 1 have?

Reference no: EM133477123

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