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Evolutionary Bio Help

As an eminent evolutionary biologist, you have spent your entire career focused on a particular group of organisms, the lolcats. You've contributed many scientific papers to the field, and are regarded as the expert on lolcats. As a life-long explorer, you have tracked the lolcats from the highest peaks in the Himilayas (home to the predatorial four-winged doomcats), to the deepest trenches of the Pacific Rim (home of 12 tentacled jellycats)--always in search of a new discovery.
As luck would have it, a species of lolcat unknown to science was recently found on an expedition to the remote jungles of Albany NY. As an expert in lolcat biology, you were approached by the National Geographic Society to conduct the first field observations of this enigmatic creature, and to analyze its phylogenetic history. After many months of rigorous study, publication in peer- reviewed journals, and media coverage, you've decided to write a new entry about this taxon in your forthcoming memoir/field guide: On the origin of lolcats.

Question: In this population of lolcats, you hypothesize that ability to see in low-light conditions is extremely important for prey capture success. The ratio of the optical aperture to the focal length of the eye's lens gives you an f-number (no units), and a lolcat with a low f-number (~1.0) will have vision that is better adapted to low light. You can assume that f-number has a simple genetic basis. Describe how you would test the following in your population of lolcats: (1) How heritable is the f-number and (2) how much variance in the trait can be attributed to the environment? What methods would you use? Which equations would be most useful, and how would you apply them?
(1-2 paragraphs)

If someone could help me out, that would be awesome!