The test cross, Mendel's dihybrid cross and law of independent assortment, the 9:3:3:1 ratio, probability rules and the chi-square test.
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.