Comparative analysis of chromosome counts infers three paleopolyploidies in the mollusca.

Both these values were highly significant ( P << 0.0001), as the 9,999 randomized data sets had from 558 to 749 steps for ordered parsimony and from 27.49 to 37.12 steps for our weighted step matrix.

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The maximum likelihood analysis presented here suggests that there is no trend in chromosome number, although the WGDs could be construed as representing a positive trend.

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