BBCCT-117 Archives - IGNOU CORNER

BBCCT-117 Assignment Master Index – Gene Organisation, Replication and Repair (2025)

BBCCT-117 Assignment Master Index – 2025 Welcome to the master index of solved assignment questions for the IGNOU course BBCCT-117 – Gene Organisation, Replication and Repair for the 2025 academic session. Each question has been answered in simple language suitable for students of all levels. Click on each question to view the full answer post. […]

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What is xeroderma pigmentosum?

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Introduction Xeroderma pigmentosum (XP) is a rare genetic disorder that affects the skin’s ability to repair damage caused by ultraviolet (UV) rays from the sun. People with XP have a defect in the DNA repair system, making them extremely sensitive to sunlight. Even small exposure can cause sunburns, skin damage, and increase the risk of

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Comment on genomic and mitochondrial DNA damage

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Introduction DNA damage is a common occurrence in all living cells. It can happen in both genomic DNA (the main DNA in the nucleus) and mitochondrial DNA (DNA inside mitochondria). Damage to either type can have harmful effects on cell function and health. Let’s understand how these damages occur and their consequences. Genomic DNA Damage

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Explain different types of mutations.

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Introduction Mutations are changes in the DNA sequence of an organism. These changes can happen naturally or due to external factors. Mutations are important in evolution, genetic diversity, and can also cause diseases. Understanding different types of mutations helps us learn how genes work and how errors in DNA affect health. What is a Mutation?

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What is RNA editing?

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Introduction RNA editing is a post-transcriptional process that alters the nucleotide sequence of RNA after it has been transcribed from DNA but before it is translated into protein. This means that the final RNA sequence may differ from the original DNA template. RNA editing helps cells create protein diversity and regulate gene expression. Definition of

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Differentiate between transposons and retrotransposons.

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Introduction Transposons and retrotransposons are types of genetic elements often called “jumping genes.” These DNA sequences can move from one location to another within the genome. They play a role in genome evolution, mutation, and gene regulation. Though both are mobile, they differ in their structure and mechanism of movement. Definition Transposons (also called DNA

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What are different types of recombination?

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Introduction Genetic recombination is a natural process by which DNA sequences are rearranged to produce new combinations of genes. This process increases genetic diversity and plays an important role in evolution, DNA repair, and cellular processes like meiosis. There are several types of recombination, each with its own mechanisms and importance. Main Types of Recombination

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Compare replication in prokaryotes and eukaryotes.

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Introduction DNA replication is a fundamental process by which a cell makes an identical copy of its DNA. Although the overall goal is the same in all organisms, there are several differences in how replication occurs in prokaryotes (like bacteria) and eukaryotes (like plants, animals, and fungi). Understanding these differences is important for studying molecular

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Write a detailed note on topoisomerases.

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Introduction Topoisomerases are special enzymes that help manage the shape and structure of DNA. DNA is a long, twisted molecule, and during processes like replication and transcription, it can get supercoiled or tangled. Topoisomerases solve these problems by cutting, twisting, and rejoining DNA strands. These enzymes are vital for keeping the DNA in good condition

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Discuss different modes of DNA replication.

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Introduction DNA replication is the process by which a cell copies its DNA before cell division. This ensures that each daughter cell receives an identical set of DNA. There are different proposed modes of DNA replication, but only one is biologically accurate. Let’s explore the various modes of replication and understand which one actually occurs

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