Course Content
Introduction to plant breeding
0/6
Introduction
Objectives of Plant Breeding
Scope of plant breeding (Future Prospects)
Undesirable effects
History of plant breeding
Scientific contributions of eminent scientists
Domestication, plant introduction, and acclimatization
0/8
Acclimatization
Plant Introduction
Types of Plant Introduction
Procedure of Plant Introduction
Purpose of plant introduction
Merits and demerits of Plant Introduction
Germplasm Collection
Domestication
Modes of reproduction and pollination control
0/11
Mode of reproduction
Asexual reproduction
Classification of Apomixis
Significance of Apomixis
SEXUAL REPRODUCTION
Significance of Sexual Reproduction
Pollination
Mechanisms promoting self-pollination
Genetic Consequences of Self-Pollination
Mechanisms promoting cross pollination
Genetic Consequences of Cross-Pollination
Qualitative and quantitative characters
0/2
Introduction
Role of the environment in Quantitative Inheritance
Biometrical techniques in plant breeding
0/4
Introduction
Importance of Biometrical techniques in Plant breeding
Components of Genetic variance
Things to remember
Selection in self-pollinated crops
0/10
Progeny test
Pureline selection
Characters of purelines
General procedure for evolving a variety by pureline selection
Advantage of pureline selection
Limitations or disadvantages of pureline selection
Achievements
Origin of variation in pure lines
Genetic Advance
Genetic gain
Hybridization techniques and its consequences
0/7
Introduction
Objectives of hybridization
Some terminologies
Types of hybridization
Pre-requisites for hybridization
Hybridization procedure or steps involved in hybridization
Consequences of hybridization
Genetic composition of cross-pollinated populations
0/5
Hardy-Weinberg law
Factors disrupting Hardy-Weinberg law
Proof of Hardy-Weinberg law
Example of Hardy-Weinberg law
Factors affecting equilibrium frequencies
Selection in cross-pollinated crops
0/11
Introduction
MASS SELECTION
Merits of Mass selection
Demerits of mass selection
Achievements
Recurrent selection
Types of recurrent selection
Advantages of Recurrent selection for general combining ability
Procedure for Reciprocal recurrent selection
Half-sib selection with progeny testing
Full-sib selection with progeny testing
Heterosis and inbreeding depression
0/8
Heterosis
Heterosis and Hybrid Vigour
Luxuriance
Manifestations of Heterosis
Inbreeding depression
Effects of inbreeding
Degrees of inbreeding depression
Use of heterosis
Mutation breeding
0/11
Introduction
Types of mutation
Classification of mutations
Characteristic feature of mutations
Procedure for irradiation
Selection of the variety and dose of mutagen
Mutation Breeding for oligogenic traits
Mutation breeding for polygenic traits
Applications of Mutation Breeding
Advantages and Limitations of mutation breeding
Achievements
Polyploidy in plant breeding
0/9
Introduction
Origin and production of doubled chromosome numbers
Morphological and cytological features of auto polyploids
Application of Autopolyploidy in Crop improvement
Limitations of auto polyploidy
Segregation in Auto tetraploids
Morphological and extological features of allopolyploids
Application of allopolyploidy in crop improvement
Limitations of Allopolyploidy
Breeding methods in self-pollinated crops
0/21
Pure Line
Pure Line Selection
Steps of pure line selection
Advantages of Pure Line Selection
Disadvantages of Pure Line Selection
Mass Selection
Steps of Mass selection
Objectives of Mass Selection
Disadvantages of Mass selection
Bulk Method
Points to consider in Bulk Method
Advantages of Bulk Method
Disadvantages of Bulk Method
Pedigree Method
Genetic Considerations
Advantages of Pedigree method
Disadvantages of Pedigree method
Single Seed Descent
Advantages of single seed Descent method
Disadvantages of single seed descent method
Backcross
Clonal selection
0/8
Clonal Selection
Sources of clonal selection
Steps involved in Clonal Selection
Advantages and disadvantages of clonal selection
Problems in Breeding asexually propagated crops
Genetic variation within a clone
Clonal degeneration
Achievements
Release of new varieties
0/7
Introduction to Variety
Norms for Release of New Variety
Development of New Variety
Criteria for classification of varieties
Institutions Related with Release of Variety
Variety Release Procedure
Brief of Variety Release
Quality seed
0/4
Introduction
Importance of quality seed
Major seed quality characters
Characteristics of good quality seed
Breeding for pest resistance
0/7
Pest includes
Disease
How disease develops?
Up to when a cultivar remains resistant?
Defense mechanisms of host against pathogen/parasite
Breeding for resistance
Selection for disease resistance
Intellectual property right
0/4
Introduction
Objectives
Types of Intellectual Property
Policy objectives favoring IPRs in new plant varieties
Learn Introductory plant breeding with Braimy- B.Sc agriculture
About Lesson
  • Depending upon the number of dominant alleles present, they are referred as simplex (Aaaa), duplex (AAaa), triplex (AAAa), Quadruplex (AAAA) and nulliplex (aaaa).
  • On selfing a simplex will produce two types of gametes Aa and aa in 1:1 ratio due to random chromosome segregation.
  • Self-pollination of such a simplex would produce. There genotypes AAaa, Aaaa and aaa in the ratio 1:2:1 giving the phenotypic ratio of 3 : 1. while produces 3 types of gametes viz., AA, Aa and aa in the ratio of 1:12:15 due to random chromatid segregation selfing of a simplex in such a case is expected produce the following progeny.

Note:

Quadraplix            AAAA        1

Triplex                  AAA a        24

Duplex                  AAaa          174

Simplex                Aaaa           360

Nulliplex               aaaa            225

Total:                                         784

Join the conversation
Previous
Next
Scroll to Top