GENETICS AND SOCIETY You have learnt from earlier lesson of this unit that genetics is the science of heredity and variation. After Mendel’s work was rediscovered in 1900, genetics progressed…

MUTATION A heritable change in the structure, content and organization of the genetic material that can be passed down to the next is termed a mutation. Mutation may occur in…

GENES AND PROTEIN SYNTHESIS The genes of an individual is its genotype, and the expression of genes results in the phenotype. For the study of protein synthesis you have to…

MOLECULAR INHERITANCE AND GENE EXPRESSION A cell contains the nucleus, nucleus contains chromosomes which bear genes. Genes carry the hereditary information. A zygote has the information for development and differentiation…

MITOCHONDRIAL INHERITANCE AS A CASE OF MATERNAL INHERITANCE Apart from the nucleus, mitochondria and chloroplasts also possess DNA. Till now you have studied about genes on the chromosomes present in…

CHROMOSOMAL THEORY OF INHERITANCE It was observed by Sutton and Boveri in 1902 that 1. Maternal (from mother) and paternal (from father) characters come together in the progeny which is…

IMPORTANT TERMS IN GENETICS Factor: the unit responsible for the inheritance and expression of a particular character. Now replaced by the term gene. Gene: It is particular segment of a…

MENDEL’S EXPERIMENTS ON THE GARDEN PEA Sir Gregor Johann Mendel (1822 to 1884) was Austrian monk who used garden pea (Pisum sativum) for his experiments and published his results in…