BBCCT-121 Archives - IGNOU CORNER

BBCCT-121 Assignment 2025 – All Questions Answered with Links

BBCCT-121: Concepts in Genetics – Solved Assignment (2025) Below is the complete list of questions from the BBCCT-121 assignment along with direct links to detailed answers. Each answer is written in easy-to-understand language for IGNOU students. Click on the questions to view the full response. Part A Explain mendel’s laws of inheritance. (a) Explain Sutton […]

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What are different types of quantitative traits? Comment on analysis of nucleotide and amino acid sequences for molecular evolution.

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Part A: Different Types of Quantitative Traits Quantitative traits are traits that do not show clear-cut categories like Mendelian traits but instead show a continuous range of variation. These traits are usually influenced by multiple genes (polygenic) and environmental factors. Types of Quantitative Traits: Continuous Traits: Traits that vary smoothly across a range (e.g., height,

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What are the limitations of pedigree analysis? Describe structural chromosomal aberrations.

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Part A: Limitations of Pedigree Analysis Pedigree analysis is a diagrammatic method used to track the inheritance of traits through generations of a family. It is a valuable tool in genetic counseling and research, but it also has several limitations: 1. Incomplete or Inaccurate Family History Sometimes, individuals may not have full information about their

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What are the characteristic features of autosomal dominant traits?

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Introduction Autosomal dominant traits are genetic characteristics that are passed from one generation to the next through a dominant allele located on one of the autosomes (non-sex chromosomes). These traits are easily observable in families because they appear in every generation. Understanding their features is essential for predicting inheritance patterns and diagnosing genetic disorders. Key

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Explain endosymbiont theory.

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Introduction The endosymbiont theory is a widely accepted explanation of how eukaryotic cells evolved from prokaryotic ancestors. It suggests that certain organelles found in modern eukaryotes, such as mitochondria and chloroplasts, were once independent prokaryotic organisms that were engulfed by a larger host cell and formed a symbiotic relationship. Origin of the Theory This theory

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What is patterning?

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Introduction In developmental biology, patterning refers to the biological processes that lead to the correct spatial and temporal arrangement of tissues and organs in a developing organism. It is a fundamental concept that ensures that body parts form in the right place and at the right time during embryonic development. Definition of Patterning Patterning is

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Describe centromere mapping in Neurospora.

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Introduction Neurospora crassa is a species of red bread mold that has been widely used in genetic studies due to its well-characterized life cycle and the ability to easily track genetic recombination. One important technique used in Neurospora is centromere mapping, which helps in identifying the position of a gene relative to the centromere on

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Differentiate between generalised and specialized transduction.

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Introduction Transduction is a process of horizontal gene transfer in bacteria, where genetic material is transferred from one bacterium to another using a bacteriophage (a virus that infects bacteria). There are two main types of transduction: generalized and specialized. Both are important mechanisms for genetic variation in bacterial populations. 1. Generalized Transduction Definition Generalized transduction

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Describe intragenic complementation and the concept of cistron.

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Introduction In classical genetics, the gene was viewed as a single, indivisible unit of function. However, with the advancement of molecular biology, researchers discovered that even within a gene, different mutations can affect different functions. This led to the discovery of concepts like intragenic complementation and the cistron. Intragenic Complementation Definition Intragenic complementation refers to

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Explain Sutton and Boveri hypothesis; Comment on lethal allele gene function.

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Part A: Sutton and Boveri Hypothesis Introduction The Sutton and Boveri hypothesis is a foundational concept in genetics that connects the behavior of chromosomes with Mendel’s laws of inheritance. It laid the groundwork for the chromosome theory of inheritance. Key Points of the Hypothesis Proposed independently by Walter Sutton (1902) and Theodor Boveri (1902). Suggested

Explain Sutton and Boveri hypothesis; Comment on lethal allele gene function. Read More »