Figure 1
From: Sequence signature analysis of chromosome identity in three Drosophila species
Results of the PCA of whole chromosome sequences from Dm (â—‹), Dy (â–³) and Dp (+). Chromosomes are colour-coded, as follows (according to the Dm numbering: black = X, yellow = 2, blue = 3 and red = 4). L and R stand for the left and right arms of the metacentric chromosomes, respectively. (A) Score plot (R2 = 0.87) of the non-normalised hexamer analysis. (B) Loading plot of the analysis in (A). (C) Score plot (R2 = 0.84) of the normalised tetramer analysis. (D) Loading plot of the analysis in (C). The colouring of the hexamers in (B) and (D) is proportional to the A/T content. Pink is all A/T and blue is all G/C.