NEET Biology Video Course

Principles of Inheritance and Variations

 Heredity

  • Genetics

  • 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          

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

  • 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 

  • 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 Mendels's Hypothesis 

  • Reason’s of mendel’s success

  • Explanation of some important terms used in genetics 

  • Test cross

  • Back cross

Chromosomal Theory of Inheritance 

  • Generic 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

Linkage and Recombination 

  • Linkage 

  • Meaning of linkage

  • Demonstration of linkage

  • Discovery of linkage

  • Kinds of linkage

  • Linkage groups

  • Factors affecting linkage

  • Significance

  • Sex linkage

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?

Sex Determination 

  • Sex Determination in Humans 

  • Sex chromosomes

  • Mechanism of sex determination

Mutation 

  • Variation 

  • Somatic(somatogenic) variation

  • Germinal (blastogenic) variation

  • Significance of variation

  • Types of mutation

  • Chromosomal mutations or abberations

  • Gene mutations

  • Origin of mutations

  • Importance of mutation

Genetic Disorders 

  • Pedigree Analysis 

Human Genetics 

  • Human hereditary traits

  • Methods of study

  • Pedigree record

  • Population genetics

  • Human cell culture

  • Human cytology

  • Study of twins

  • Human chromosomes

  • Number

  • karyotype

Mendelian Disorders 

  • Sickle shaped Anaemia 

  • Haemophilia 

  • Phenylketonuria 

  • Mendelian disorders

  • Haemophilia (Bleeder’s disease)

  • Sickle-celled anaemia

  • Alkaplonuria (alcaptonuria)

  • Phenylketonuria (PKU)

  • Albinism

  • Red-green color blindness

  • Night blindness

  • Muscular dystrophy

 Chromosomal Disorders 

  • Downs syndrome 

  • Klinefelter's Syndrome 

  • Turner's Syndrome 

  • Chromosomal disorders

  • Aneuploidy

  • Polyploidy

  • Down’s syndrome

  • Klinefelter’s syndrome

  • Turner’s syndrome

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