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 Principles of Inheritance and Variations

Online Biology Class 

  • Following is the list of topics that are covered during online biology classes for NEET preparation.

  • After completion of all the topics of the chapter, MCQs based on NEET Pattern questions are discussed.

  • Doubts during the class are also cleared. You can also post your doubts and we will promptly answer it.

27.1 Heredity

  • Genetics

27.2 Early or pre-mendelism theories of heredity

  • Vapour theory

  • Fluid theory

  • Preformation theory

  • Particulate theory

  • Theory of pangenesis

  • Basis of heredity

  • Physical basis

  • Chemical basis          

27.3 MENDELIAN LAWS OF INHERITANCE

  • Ineheritance Of One Gene

  • Law Of Dominance

  • Law Of Segregation

  • Incomplete Dominance

  • Co-Dominance

  • Mendelism

  • Mendel’s life- rediscovery of mendel’s findings

  • Mendel’s experimental plant

  • Mendel’s experimental technique

  • Selection of pure parent plants

  • Hybridization of pure plants

  • Self pollination in hybrids

27.4 MENDEL’S MONOHYBRID CROSS (INHERITANCE OF ONE GENE)

  • The experiment

  • F1 generation

  • F2 generation

  • F3 generation

  • Reciprocal crosses

  • Findings(results) of Monohybrid Crosses

  • Conclusions drawn from the Monohybrid crosses

  • Introduction of the term gene

  • Law of unit or paired factors

  • Law of dominance

  • Law of segregation

  • Important prediction

  • Traits do not blend

  • Mendel’s monohybrid phenotypic ratio

  • Mendel’s principles(Laws) of Heredity on the basis of genes

  • Two fundamental principles of heredity

  • Variable principles of heredity

  • Principle (Law) of paired factors- statement, elaboration

  • Principle (Law) of dominance- statement, explanation, types (degrees) of dominance

  • Mendel’s first law- the Law of segregation

  • Statement

  • Explanation

  • Cross between guinea-pigs

  • Cross between pea plants

  • Inheritance of two genes

  • Law of independent assortment

27.5 MENDEL’S DIHYBRID CROSS (INHERITANCE OF TWO GENES)

  • The experiment

  • Findings (results) of Dihybrid cross

  • Four types of plants

  • New combinations

  • Conclusion drawn from a dihybrid cross- law of independent assortment

  • Mendel’s dihybrid phenotypic ratio

  • Mendel’s second Law- the Law of independent assortment

  • Mendel's trihybrid cross

  • Summary of Mendel's Hypothesis

  • Reason’s of mendel’s success

  • Explanation of some important concepts

  • Test cross

  • Back cross

27.6 GENETIC PRINCIPLES DISCOVERED AFTER MENDEL

  • Important discoveries

  • Parallelism between mendelian factors and chromosomes

  • Chromosome theory of inheritance

  • Incomplete dominance (blended inheritance)

  • Codominance

  • Multiple alleles

  • Complementary genes

  • Supplementary or modifying genes

  • Polygenic traits- quantitative inheritance

  • Epistasis and hypostasis

  • Pleiotropy

  • Lethal genes

27.7 LINKAGE AND RECOMBINATION

  • LINKAGE

  • Meaning of linkage

  • Demonstration of linkage

  • Discovery of linkage

  • Kinds of linkage

  • Linkage groups

  • Factors affecting linkage

  • Significance

  • Sex linkage

27.8 CROSSING OVER (GENETIC RECOMBINATION)

  • Discovery

  • Meaning

  • Illustration

  • Mechanism of crossing over

  • Result of crossing over

  • Types of crossing over

  • Factors affecting crossing over

  • Significance of crossing over

  • Why mendel missed linkage?

27.9 SEX DETERMINATION

  • Sex determination in humans

  • Sex determinations

  • Sex chromosomes

  • Mechanism of sex determination

27.10 MUTATION

  • variation

  • Somatic(somatogenic) variation

  • Germinal (blastogenic) variation

  • Significance of variation

  • Mutation

  • Introduction

  • Types of mutation

  • Chromosomal mutations or abberations

  • Gene mutations

  • Origin of mutations

  • Importance of mutation

27.11 GENETIC DISORDERS

27.12 PEDIGREE ANALYSIS

27.13 HUMAN GENETICS

  • Human hereditary traits

  • Methods of study

  • Pedigree record

  • Population genetics

  • Human cell culture

  • Human cytology

  • Study of twins

  • Human chromosomes

  • Number

  • karyotype

27.14 MENDELIAN DISORDERS

  • Sickle Cell Anaemia

  • Haemophilia

  • Phenylketonuria

  • Genetic disorders

  • Mendelian disorders

  • Haemophilia (Bleeder’s disease)

  • Sickle-celled anaemia

  • Alkaplonuria (alcaptonuria)

  • Phenylketonuria (PKU)

  • Albinism

  • Red-green color blindness

  • Night blindness

  • Muscular dystrophy

27.15 CHROMOSOMAL DISORDERS

  • Down's Syndrome

  • Klinefelter's Syndrome

  • Turner's Syndrome

  • Chromosomal disorders

  • Aneuploidy

  • Polyploidy

  • Down’s syndrome

  • Klinefelter’s syndrome

  • Turner’s syndrome

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