Dominant epistasis (13 : 3 in chickens), recessive epistasis (9 : 7 in sweet pea), polygenic skin colour, pleiotropy in sickle-cell disease and cystic fibrosis, and epigenetics.
Deshapriya Senevirathne. B.Sc. (Hons) Biology Special, University of Peradeniya — graduated with a class pass. All the content and lessons in A/L Biology on Paadama are reviewed by Deshapriya Senevirathne, and the lessons are taught by him.