Principles of Inheritance and Variation

This topic deals with the concept of heredity and variations. It explains the different types of variations and the differences between somatogenic and blastogenic variations. It also discusses some important terms related to heredity and variation.

In this topic, we will study Mendel's experiments and laws of inheritance. It explains the main aim of Mendel’s experiments. We will also learn why a Pea Plant was selected for his experiments.

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.

In this topic, we will learn about the deviations of Mendelism. It explains in detail complete and incomplete dominance. A brief note on complementary genes and epistasis is also given here.

This topic briefs on the chromosomal theory of inheritance and the steps involved in this theory. It discusses the contributions of Walter Sutton and Theodore Boveri towards this theory. We will study the differences between chromosomes and genes.

In this topic, we will learn about linked genes and their types. It briefs on Bateson and Punnett experiment on linkage. It also explains crossing over and its types along with its mechanism and significance.

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

This topic describes sex-linked inheritance along with examples. It briefs on male heterogamy and female heterogamy. Sex-linked inheritance in Drosophila and humans are also discussed with examples and diagrams.

The topic describes mutation as a process of instability in the genetic material. We will learn in detail the different types of mutations, such as spontaneous mutation, induced mutation, point mutation and chromosomal mutation.

This topic sheds light on genetic disorder in human beings. It focuses on Mendelian disorders and chromosomal disorders along with examples. The amino acid composition of normal and sickle-cell anaemia person is also discussed here.

In this topic, we will learn about chromosomal disorders caused by excessive or absence of chromosomes. It also provides information on Down syndrome, Turner syndrome and Klinefelter syndrome along with their symptoms.