Since reading The Selfish Gene when I was about 16 I developed a strong interest in Genetics. This led to me stuyding BSc Zoology & Genetics at The University of Sheffield (sadly they no longer run this excellent complementary dual-honors course) and then for an MSc Genetic Epidemiology, again in Sheffield (I was one of four students who took the course in its first year of running).
Genetics is a huge area, and has many different facets from classical genetics dating back to Gregor Mendel, the neo-Darwinist revolution based on the work of Fisher, Wright and Haldane through to the molecular revolution that ensued from the discovery of the structure of DNA by Watson and Crick.