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Syllabus of B.Sc. III - Botany
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Syllabus - B.Sc. III 2020-21
Paper IX : Genetics and Plant Breeding
Unit 1: Mendelism
Topic 1
1.1 Introduction,
Definition and
Basic terminologies in genetics.
1.2 Principles of inheritance
a) Law of Dominance
b) Law of Segregation
c) Law of independent assortment.
1.3 Gene Interaction-
a) Complementary gene interaction
b) Supplementary gene interaction.
Unit 2
Linkage and Recombination
Topic 2
2.1 Linkage:
Definition, Linkage group, Types, Coupling and
Repulsion phase, Significance.
2.2 Recombination (Crossing over):
Definition, Types ,
Mechanism of crossing over,
Significance
2.3 Mutation –
Definition, Spontaneous and Induced mutation.
Types of mutagen Physical and Chemical,
Significance
Unit 3
Chromosomes structure and Variation
Topic 3
3.1 Chromosome structure -
Introduction, Types (based on position of centromere)
3.2 Multiple allelism:
Introduction, Definition, Self-incompatibility in plants
3.3 Quantitative inheritance:
a) Polygene inheritance- Concept, examples- Kernel colour in wheat,
b) Population genetics- Hardy-Weinberg’s law
3.4 Maternal inheritance-
Mendelian versus cytoplasmic inheritance, Plastid inheritance in Mirabilis jalappa.
3.5 Alternation in genetic make-up and its significance
a) Change in chromosome structure- Deletion,
Duplication, Inversion and Translocation.
b) Change in chromosome number- Euploidy and Aneuploidy.
Unit 4
Plant Breeding
Topic 4
4.1 Introduction, Definition of plant breeding.
4.2 Aims and objectives of plant breeding
4.3 Methods of plant breeding
a) Introduction and acclimatization
b) Selection- i) Mass selection ii) Pure
line selection iii) Clonal selection
c) Hybridization techniques in self and
cross pollinated crops.
d) Male sterility and its significance
e) Mutation breeding- Gamma garden