good question bryansullo!
i had to hunt through the lessons again to find that info and found it in the animal lesson tips and notes: https://www.duolingo.com/skill/uk/Animals
there are 2 links to the genitive in the tips and notes about half-way down.
one link is here: http://www.ukrainianlanguage.org.uk/read/unit05/page5-3.htm
on that link, on the right side is a numbered list, and number 7 is "cases in general" that gives something on each case.
hope that helps!