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Question

A.ay_a. | t? , Ica-u. I1Normal 11NoSpac.. u .absx, x''. He Font Paragraph QUESTIONS X>autosomes Xautosomes X-autosomes Branch not tested Neutral divergence D. melanogaster D. sechellia D. simulans _ D. yakuba D. erecta Figure 1 A phylogeny for five of the Drosophila species, depicting results for changes at four fold degenerate sites, which are third-codon-position sites where all four different third-position codons encode the same amino acid. Red indicates regions of the phylogeny where the rate of change of these four fold degenerate sites is significantly higher on the X than on the autosomes, while blue indicates regions where the rate of change is significantly higher on the autosomes. Black indicates regions of the phylogeny where the rates are not significantly different between the X and the autosomes, while green is for branches that haven't been tested Question 1. Which species is most closely related to D.yokube? Question 2. Did D. simulans last share a common ancestor with D. melanogaster before, after, or at the same time as when D. sechelig last shared a common ancestor with D Question 3. Is the rate of divergence at neutral sites on the X chromosome faster, slower or about the same as that on the autosomes along the lineage leading to D erecta? Along the lineage leading to D. simulans here to search 53

Explanation / Answer

D. melanogaster is the closely related to D. yakuba. D. simulans share a common ancestor at the same time as when D. sechellia last shared a common ancestor with D. melanogaster. The rate of divergence at neutral sites on the X chromosome   is about the same as that on the autosomes along the lineage leading to D. simulans.

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