Solutions of Principles Of Inheritance And Variation from BIOLOGY TEXTBOOK FOR CLASS 12 - hr

This topic discusses the hybridisation experiment on garden peas by Mendel. He had chosen 14 true-breeding varieties of pea plants to conduct his experiment. It also includes a table that shows the contrasting traits studied by Mendel.

This topic explains the experiment of Mendel’s inheritance of one gene along with a schematic representation. Further, it gives a detailed explanation of the law of inheritance.

This topic describes Mendel’s inheritance of two genes. Mendel carried out his experiment with pea plants having two different characters. Further, it explains the law of independent assortment and the chromosomal theory of inheritance.

This topic explains polygenic inheritance. Polygenic inheritance refers to a single phenotypic feature inherited by several individual genes. It is explained with an example.

This topic describes pleiotropy. Pleiotropy occurs when the phenotype of many distinct and unrelated traits is coded and regulated by one gene. Phenylketonuria is a pleiotropic-caused disease.

This topic discusses the determination of sex in insects, humans and honeybee with supportive diagrams.

This topic defines mutation and briefs the factors that induce mutation. A mutation is the sudden change in the DNA sequences, which result in the changes in the genotype and phenotype of an organism.

This topic discusses Mendelian disorders and chromosomal disorders. Genetic disorders are diseases that are transmitted from one generation to other without any alteration.