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This compilation of study material on ZO-315: Genetics for the students of T.Y.B.Sc. Zoology. This material has been prepared in accordance with the syllabus prescribed under NEP 2020 by the Board...

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Genetics - ZO-315
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This compilation of study material on ZO-315: Genetics for the students of T.Y.B.Sc. Zoology. This material has been prepared in accordance with the syllabus prescribed under NEP 2020 by the Board of Studies in Zoology, KBC North Maharashtra University, Jalgaon, and implemented from June 2026.
This publication is not intended to be an original textbook; rather, it is a carefully compiled study resource prepared from various standard textbooks, reference books, research articles, and other authentic academic sources. The objective is to provide students with concise, organized, and easily understandable study material that facilitates effective learning of the subject.
The contents have been presented in simple and lucid language, covering the essential concepts and details required by the syllabus. Relevant references and sources have been acknowledged to enable students and teachers to explore the subject further. This compilation aims to serve as a ready reference for classroom learning, self-study, assignments, and examination preparation.
This study material will prove useful to both students and teachers in developing a deeper understanding and appreciation of the subject of Zoology.

UNIT 1.................................................................................7 Introduction to Genetics
• Genetics: Definition, Scope
• Mendel’s Experiments
• Mendel’s Laws of Inheritance: (a) Law of dominance; (b) Law of segregation or purity of gametes; (c) Law of independent assortment

UNIT 2..............................................................................17 Mendelian Genetics and Its Extension – I
• Chromosomal Theory of Inheritance; Evidence to support the chromosomal theory
• Incomplete Dominance with example
• Co-dominance
• Epistasis and Pleiotropy: Dominant epistasis; Recessive epistasis; Pleiotropism
• Multiple Alleles; ABO Blood group system; Inheritance of ABO Blood group

UNIT 3................................................................................33 Mendelian Genetics and Its Extension – II
• Lethal Gene: Dominant Lethal Gene – Huntington’s disease; Recessive Lethal Gene – Tay-Sachs disease
• Sex-linked inheritance: (a) X-linked Dominant and Recessive Inheritance – Haemophilia; (b) Y-linked inheritance – Hypertrichosis; (c) X-Y linked inheritance – Xeroderma pigmentosum

UNIT 4...............................................................................41 Sex Determination
• Mechanisms of Sex Determination (Environmental and Chromosomal)
• Sex Determination in Humans
• Sex Determination in Drosophila and Dosage Compensation
• Applications of AI in Genetics

REFERENCES....................................................................55

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