IGNOU MZO 004 SOLVED ASSIGNMENT

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MZO 004 2025 - English

ASSIGNMENT

Course Code: MZO-004

Assignment Code: MZO-004/TMA/2025

Maximum Marks: 100

Note: Attempt all questions. The mark for each question is indicated against it.

1 Discuss the evidence supporting the RNA World Hypothesis and its  implications for understanding the transition from prebiotic chemistry to cellular life.

2. Discuss the role of horizontal gene transfer in shaping the evolutionary relationships among domains of life.

What is the concept of speciation in bacteria, and how does it differ from speciation in eukaryotic organisms?

4. What is the molecular clock? Describe how is it used to estimate the timing of evolutionary events?

5. How did endosymbiosis contribute to the evolution of eukaryotic genomes, and what evidence supports the theory of endosymbiotic origin for organelles like mitochondria and chloroplasts?

6. Describe the role played by genomic changes, such as chromosomal rearrangements, gene duplications, and regulatory divergence, in the process of speciation?

7. What are the key differences between the artificial and natural systems of classification? Differentiate between diploblastic and triploblastic animals based on any five characteristics.

8. What is Taxonomic diversity? Describe its various types.

Describe the different stages in the origin of Homo sapiens. Also, draw a well-labeled human evolution tree.

10. Describe the following

a) Abiogenesis

b) Phylogenetic tree

c) Exon shuffling

d) Artificial speciation

MZO 004 (January 2026 - July 2026) - ENGLISH

ASSIGNMENT

(Tutor Marked Assignment)

Course Code: MZO-004

Assignment Code: MZO-004/TMA/2026

Maximum Marks: 100

Note: Attempt all questions. The mark for each question is indicated against it.

1.

(a) Explain how the principles of evolutionary biology account for antibiotic resistance in bacteria and highlight its broader applications in science and society.

(b) Describe how the Big Bang theory, formation of Earth, and the concept of chemical evolution together explain the origin of life on our planet.

2.

Explain the key features and representation of phylogenetic trees, including nodes, branches, root, terminal nodes, outgroup, scaled (phylogram) and unscaled (cladogram) trees, rooted and unrooted trees, polytomy, and monophyletic, paraphyletic, and polyphyletic groups.

3. Describe the key features, variability, and biological significance of bacterial genomes, including operons, plasmids, PHX genes, and adaptations in Deinococcus radiodurans.

4. Explain the role of plasmids in horizontal gene transfer in bacteria, including F, Hfr, and F' plasmids, and their significance in antibiotic resistance, virulence, and genetic recombination.

5.

(a) Explain the two models proposed for the origin of the endoplasmic reticulum (ER) in eukaryotes and discuss how ER evolution is linked to the development of protein secretion pathways and the Golgi apparatus.

(b) Describe how mitosis, meiosis, and sexual reproduction likely evolved in early eukaryotes, and explain how diploidy and meiosis provide survival and genetic diversity advantages.

6. Explain the theory of endosymbiosis and describe how primary endosymbiosis led to the origin of mitochondria and chloroplasts, including gene transfer to the host nucleus and loss of independence of these organelles.

7.

(a) Explain the differences between Artificial, Natural, and Phylogenetic systems of classification, giving examples and their importance in studying relationships and evolution of organisms.

(b) Explain the components of taxonomy and describe the different types of taxonomy, including classical, modern, and molecular approaches, with suitable examples.

8.

(a) Discuss the role of cyanobacteria in transforming Earth's early environment and explain how this change influenced the evolution of complex life forms.

(b) Differentiate between catastrophic, mass, and background extinctions with suitable examples from Earth's history.

9. Discuss the unique anatomical and genetic traits that distinguish modern humans from other hominins and great apes.

10. Describe the following:

a) RNA World hypothesis

b) Molecular drive

c) Evolution of gene families

d) Sympatric speciation

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