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How do I filter reverse related entries by category group. I’d like a Category Group Name as a header for a sub nav.
So for instance, the categories are split into DNA and RNA services. Those are the two category groups. But I can’t figure out how to call just one group in a reverse related entries call.

I don’t think you can access any category data through the reverse_related_entries tag.  As far as I know, in order to achieve this functionality you’d need a custom query.

I found a way to do it although it’s not pretty. If anyone else has a more elegant solution, I’d like to hear it.

DNA
  {reverse_related_entries}
  {categories limit="1"}{if category_group == "2"}{/categories}
    <li><a href="http://{url_title_path=services/category}" title="{categories}{category_name}{/categories}">{categories backspace="2"}{category_name} - {/categories}</a></li>
    {/if}
  {/reverse_related_entries}
  
  RNA
  {reverse_related_entries}
  {categories limit="1"}{if category_group == "3"}{/categories}
    <li><a href="http://{url_title_path=services/category}" title="{categories}{category_name}{/categories}">{categories backspace="2"}{category_name} - {/categories}</a></li>
    {/if}
  {/reverse_related_entries}

I’m shocked that that does anything, much less what you want it to do 😛

If it works and performs quickly enough I’d just leave it be.  The more elegant alternative would be in the form of custom queries and possibly some plugin or PHP logic. It wouldn’t be awful to write, but it’d take some time so unless there’s a compelling reason not to use what you’ve got… ya know 😉