17. You sequence 2 genes from each of 3 species. The species are called A,B, and

Question

17. You sequence 2 genes from each of 3 species. The species are called A,B, and C. From species A, you obtain gene1 and gene2; from species B you obtain gene3 and gene4; from species C you obtain gene5 and gene6. What would you guess about the species tree if you obtained the following gene tree : ((gene1, (gene3, gene5)), ((gene4, gene6), gene2))

18. If you knew from other evidence that the species tree in #17 was (A, (B, C)); draw a possible scenario with gene duplications and losses that could explain the incongruence between gene tree and species tree.

Explanation / Answer

17. Ans-

Given that,

Species A, obtain gene1 and gene2;

Species B, obtain gene3 and gene4

Species C, obtain gene5 and gene6.

Gene tree: ((gene1, (gene3, gene5)), ((gene4, gene6), gene2))

The order of species tree is ((B, C) A)

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