BY Team Aakash Byjus

Class 12 CBSE: Revision Notes

Principles of Inheritance & Variation

Here are some important revision notes on the chapter ‘Principles of Inheritance and Variation’:

The definitions of inheritance and variation must be studied initially.

Don’t miss out on the point

 Gregor Johann Mendel is known as the ‘Father of Genetics’.

Learn Mendel’s Law of Inheritance and the working method.

List all the contrasting characters studied by Mendel in Pea.

Study the test cross and prepare yourself to explain it with a tree diagram.

Based on the experiments, explain what are: - Law of dominance - Law of Segregation - Incomplete dominance - Co-dominance

You should be able to explain ‘the Law of Independent Assortment’ with a diagram.

Also, study ‘Chromosomal theory of inheritance’ and the definition of  linkage and recombination.

 You  can be asked to list the differences in crossing over and linkage, so be prepared for it as well.

‘Sex determination’ is one more major topic where you need to explain how the sex of the baby can be determined in humans using a diagram.

Mutation, pedigree analysis, genetic disorders (Mendelian disorder & chromosomal disorder), are important topics that come at the end of the chapter.

Be aware of all types of syndromes that are caused due to genetic disorders with details.

If these notes are helpful, share and help your friends too.