General intoduction, types of variation and continuous and discontinuous variation
SENSORY RECEPTORS AND SENSE ORGANS
Other discoveries like sex linkage, mutation, multiple alleles,non disjunction, polygenic inheritance
New discoveries on incomplete dominance, co-dominance,sex determination etc
Structures of chromosomes, DNA replication, Genetic codes, crossing over and fertilization
Alleles, pure breed, recessive and dorminant charecter