Heredity and Variation: Mendel’s Laws of Inheritance with reference to Drosophila. (Drosophila Melanogaster Grey, Black Body Colour; Long, Vestigial Wings), Pleiotropy; Multiple Alleles: Inheritance of Blood Groups and Rh-factor; Codominance (Blood Groups as example); Elementary Idea of Polygenic Inheritance; Skin colour in Humans (refer Sinnott, Dunn and Dobzhansky); Sex Determination – in Humans, Birds, Fumeamoth, genic balance Theory of Sex Determination in DroMophila melanogaster and Honey Bees; Sex linked Inheritance – Haemophilia, Colour blindness; Mendelian disorders in Humans: Thalassemia, Haemophilia, Sickle celled Anaemia, Cystiefibrosis PKU, Alkaptonuria; Chromosomal Disorders – Down