Karyotypes, non-disjunction and aneuploidy, Down, Turner and Klinefelter syndromes, polyploidy, and structural changes in chromosomes.
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.