Class 12 Biology - ODISHA
Molecular Basis of Inheritance
The chapter Molecular Basis of Inheritance in Class 12 Biology explores the genetic material of living organisms, focusing on DNA and RNA. Students will learn about the structure of DNA, the double helix model, DNA replication, transcription, translation, and the central dogma of molecular biology. It also covers gene expression and regulation, particularly the Lac operon, along with the Human Genome Project and DNA fingerprinting. This chapter is vital for the Odisha BSE board exams as it forms the foundation of modern genetics, carrying a high weightage of conceptual and descriptive questions that frequently appear in both theory and practical evaluations.
Start Learning FreeKey Concepts
DNA Structure
DNA is a double-stranded polynucleotide where two chains run antiparallel, twisted into a right-handed double helix with nitrogenous bases bonded via hydrogen bonds.
Central Dogma
The unidirectional flow of genetic information states that genetic information flows from DNA to mRNA via transcription, and then from mRNA to proteins via translation.
DNA Replication
The semi-conservative process by which a DNA molecule makes an exact copy of itself using enzymes like DNA polymerase and DNA ligase.
Transcription
The synthesis of a complementary RNA strand from a specific DNA template strand, catalyzed by the enzyme RNA polymerase.
Lac Operon
An inducible gene regulation system in bacteria like E. coli consisting of a promoter, operator, and structural genes that metabolize lactose.
DNA Fingerprinting
A technique used to identify individuals based on variations in their DNA sequences, specifically repetitive DNA regions called VNTRs.
Important Formulas
Board Exam Info
In the Odisha BSE Class 12 Biology examination, this chapter typically carries around 8 to 12 marks. Questions frequently include long-form descriptive questions on the semi-conservative replication of DNA, the mechanism of translation, the Lac operon model, and differences between DNA and RNA, alongside multiple-choice and short answer questions.
Frequently Asked Questions
Why is DNA replication called semi-conservative?
It is called semi-conservative because each newly formed DNA molecule consists of one original parent strand and one newly synthesized strand.
What is the role of tRNA during translation?
tRNA acts as an adapter molecule that brings specific amino acids to the ribosome according to the codon sequence on the mRNA.
What is the difference between exons and introns?
Exons are coding sequences of DNA that are expressed in proteins, whereas introns are non-coding sequences that are spliced out during RNA processing.
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