HELP?

I am working on a project and have a list of genes I'm looking at.  I would like to generate a random control list of genes that has the same number of genes and approximately the same coding length as my gene list of interest.  Is there anything in bioconductor that can do this.  The basic question is:  "Is the number of variants identified by NGS in our sample set greater in our gene list of interest when compared to a random list of genes which contains the same number of genes of approximately equal coding length.

Thanks