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PYQ 2011

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Why reading newspaper is important for prelims, mains and interview? Source - The hindu + Business line + Indian express + Business standard+ Other papers + pib Read, Books Newspaper PYQ

BATCH-02 I am happy to announce that enrollment is now open for Xinsheng’26 Prelims Complete Guidance Program — Test Batch + Mentoring! Course Highlights Two classes per week: Tuesday & Thursday 40 plus “live” Revision classes and PYQ analysis “Live” CSAT classes included Mode: Online + Offline Recorded classes available for all sessions Course Duration: Till Prelims 2026 Weekly Sunday Offline Test (All offline tests can also be accessed through the MoA website’s app format) Additional Online Chapter-wise Tests for Xinsheng’26 students Direct mentoring until Prelims 2026 And much more… 📞 Enrollment You can directly contact us for joining, or enroll through our website and send the payment slip to our official ID: @moa_official 🌐 Website: https://mindsofaspirants.com/ Test Portal (Prelims Tests): https://prelims.mindsofaspirants.com/ Thank you for your continued support!

Key Definitions (To be noted for Anthropology paper 1) 1) Prokaryotic Definition: A prokaryotic cell is a cell without a true nucleus and without membrane-bound organelles. Genetic material lies freely in the cytoplasm. Example: Bacteria (e.g., E. coli) ⸻ 2) Eukaryotic Definition: A eukaryotic cell is a cell with a true nucleus and membrane-bound organelles like mitochondria and endoplasmic reticulum. Example: Human cell ⸻ 3) Animal Cell and Plant Cell Animal Cell – Definition: A eukaryotic cell lacking cell wall and chloroplast, usually round or irregular in shape. Example: Human cheek cell Plant Cell – Definition: A eukaryotic cell with a cell wall, chloroplasts, and a large central vacuole. Example: Onion peel cell ⸻ 4) Nucleus Definition: The nucleus is a membrane-bound organelle that stores DNA and controls all cellular activities. Example: Nucleus in a liver cell ⸻ 5) DNA and RNA DNA – Definition: Deoxyribonucleic acid (DNA) is the genetic material that stores hereditary information. Example: DNA in chromosomes RNA – Definition: Ribonucleic acid (RNA) helps in protein synthesis by carrying genetic instructions from DNA. Example: mRNA ⸻ 6) Mitochondria Definition: Mitochondria are membrane-bound organelles that produce energy (ATP) and are called the powerhouse of the cell. Example: Mitochondria in muscle cells ⸻ 7) Ribosome Definition: Ribosomes are small organelles that synthesize proteins using amino acids. Example: Ribosomes on rough endoplasmic reticulum ⸻ 8) Amino Acid and Protein Amino Acid – Definition: An amino acid is the basic building block of proteins. Example: Glycine Protein – Definition: A protein is a chain of amino acids that performs structural, enzymatic, or regulatory functions. Example: Hemoglobin ⸻ 9) Gene Definition: A gene is a segment of DNA that codes for a specific trait or protein. Example: Gene for blood group ⸻ 10) Transcription Definition: Transcription is the process by which DNA information is copied into RNA. Example: Formation of mRNA from DNA ⸻ 11) Alleles Definition: Alleles are alternative forms of the same gene located at the same position on homologous chromosomes. Example: Alleles for tall (T) and dwarf (t) plant ⸻ 12) Chromosome Definition: A chromosome is a thread-like structure of DNA and protein that carries genes. Example: Human chromosome 1 ⸻ 13) Homozygous and Heterozygous Homozygous – Definition: An individual having two identical alleles for a trait. Example: TT or tt Heterozygous – Definition: An individual having two different alleles for a trait. Example: Tt ⸻ 14) Principles (Laws) of Mendel Definition: Mendel’s principles explain how traits are inherited from parents to offspring. Three Principles: 1. Law of Dominance – Dominant allele masks recessive allele 2. Law of Segregation – Alleles separate during gamete formation 3. Law of Independent Assortment – Different traits assort independently Example: Inheritance of height in pea plants ⸻ 15) Mendelian and Non-Mendelian Inheritance Mendelian Inheritance – Definition: Inheritance that follows Mendel’s laws, involving single-gene traits. Example: Pea plant height Non-Mendelian Inheritance – Definition: Inheritance that does not follow Mendel’s laws due to factors like incomplete dominance, codominance, or polygenic traits. Example: Human blood group (ABO) ⸻ 16) Race and Ethnicity Race – Definition: A biological classification based on physical traits such as skin color and facial features. Example: Caucasoid (traditional classification) Ethnicity – Definition: A social and cultural classification based on language, culture, religion, and shared history. Example: Tamil ethnicity

Quotes for Essay Upsc mains essay

Q) Gene Expression (10 marks) Gene (DNA) ↓ Transcription ↓ mRNA formation ↓ Translation ↓ Protein synthesis ↓ Functional protein activity ↓ Phenotype (observable trait)

BASIC GENETIC TERMS – ⸻ 1. Allele Definition: An allele is an alternative form of a gene present at the same locus on homologous chromosomes. Example: • Gene for height → • T = Tall • t = Dwarf 👉 T and t are alleles of the same gene. ⸻ 2. Allele Frequency Definition: Allele frequency refers to the proportion or distribution of a particular allele in a given population. Meaning: • Population-level concept • Helps understand genetic variation and evolution ⸻ 3. Locus (plural: Loci) Definition: A locus is the specific physical position of a gene or allele on a chromosome. Key idea: • Every gene has a fixed address on a chromosome • Same gene → same locus on homologous chromosomes ⸻ 4. Mutation What is Mutation? Definition: A mutation is a permanent, heritable change in the DNA sequence at the gene level or chromosomal level. ⸻ Molecular Explanation (Watson–Crick based) • DNA is made of base pairs: A–T and G–C • Mutation occurs when: • One base pair is substituted, deleted, or added Example: • Normal: A–T • Mutated to: • T–A • C–G • G–C 👉 This change alters the genetic message ⸻ Types of Mutation (based on level) (a) Gene Mutation • Small, point-level change • Affects gene function or expression • Example: one codon replaced by another (b) Chromosomal Mutation • Large-scale structural changes • Includes: • Deletion • Duplication • Inversion • Translocation 👉 These affect chromosome structure, not just one gene. ⸻ 5. Dominant and Recessive Alleles Dominant Allele • Expressed even in heterozygous condition • Does not skip generations • Masks the recessive allele Example: • Tt → Tall phenotype ⸻ Recessive Allele • Expressed only in homozygous condition • Can skip generations • Often less frequently expressed Example: • tt → Dwarf phenotype ⸻ Important Rule • One recessive allele does not affect phenotype • Trait appears only when both alleles are recessive (dd) 👉 Parents of a recessive child must be carriers. ⸻ 6. Genotype and Phenotype Genotype • Genetic constitution of an individual • Example: TT, Tt, tt ⸻ Phenotype • Observable expression of a genotype • Example: Tall or Dwarf ⸻ Relationship Genotype → Phenotype The phenotype is the outcome of gene expression. ⸻ 7. Why is it called Mendelian Mutation? • Mendel studied traits that: • Are controlled by single genes • Show clear dominant–recessive patterns • Mutations that: • Follow Mendelian inheritance laws • Affect single gene expression → are called Mendelian mutations

Gregor Johann Mendel – Father of Genetics Who was Mendel? Gregor Johann Mendel was an Austrian monk and scientist who laid the foundation of modern genetics. Why is he important? He scientifically explained how traits are inherited from parents to offspring. ⸻ Mendel’s Experiments (in simple words) • Selected garden pea plant (Pisum sativum) • Chose peas because: • Easy to grow • Short life cycle • Clear contrasting traits (tall/dwarf, round/wrinkled seeds) • Naturally self-pollinating but easy to cross-pollinate • Selected pure breeding (homozygous) plants • Studied: • Monohybrid cross → one trait • Dihybrid cross → two traits ⸻ Key Terms (before laws) • Gene: Unit of inheritance • Allele: Alternative form of a gene • Genotype: Genetic makeup (TT, Tt, tt) • Phenotype: Physical appearance (tall/dwarf) • Dominant: Expressed even in heterozygous condition • Recessive: Expressed only in homozygous condition ⸻ Mendel’s Three Laws of Inheritance ⸻ 1. Law of Dominance Statement: When two contrasting alleles are present together, only one (dominant) expresses itself, while the other (recessive) remains hidden. Example: • Tall (T) × Dwarf (t) • F₁ generation → All plants are Tall (Tt) Key idea: 👉 Dominant allele masks the recessive allele. ⸻ 2. Law of Segregation (Law of Purity of Gametes) Statement: During gamete formation, the two alleles of a gene separate from each other, so each gamete carries only one allele. Example: • Parent genotype: Tt • Gametes formed: T and t (not mixed) Result: • Alleles remain pure and do not blend. F₂ ratio (monohybrid cross): • Phenotype → 3 Tall : 1 Dwarf • Genotype → 1 TT : 2 Tt : 1 tt ⸻ 3. Law of Independent Assortment Statement: Alleles of different genes assort independently during gamete formation. Applicable to: • Dihybrid crosses Example: • Seed shape (Round/Wrinkled) • Seed colour (Yellow/Green) F₂ Phenotypic ratio: 👉 9 : 3 : 3 : 1 Key condition: •Genes should be on different chromosomes (or far apart on the same chromosome)

BATCH-02 I am happy to announce that enrollment is now open for Xinsheng’26 Prelims Complete Guidance Program — Test Batch + Mentoring! Course Highlights Two classes per week: Tuesday & Thursday 40 plus “live” Revision classes and PYQ analysis “Live” CSAT classes included Mode: Online + Offline Recorded classes available for all sessions Course Duration: Till Prelims 2026 Weekly Sunday Offline Test (All offline tests can also be accessed through the MoA website’s app format) Additional Online Chapter-wise Tests for Xinsheng’26 students Direct mentoring until Prelims 2026 And much more… 📞 Enrollment You can directly contact us for joining, or enroll through our website and send the payment slip to our official ID: @moa_official 🌐 Website: https://mindsofaspirants.com/ Test Portal (Prelims Tests): https://prelims.mindsofaspirants.com/ Thank you for your continued support!

BATCH-02 I am happy to announce that enrollment is now open for Xinsheng’26 Prelims Complete Guidance Program — Test Batch + Mentoring! Course Highlights Two classes per week: Tuesday & Thursday Mode: Online + Offline Recorded classes available for all sessions Course Duration: Till Prelims 2026 Weekly Sunday Offline Test (All offline tests can also be accessed through the MoA website’s app format) Additional Online Chapter-wise Tests for Xinsheng’26 students Direct mentoring until Prelims 2026 And much more… 📞 Enrollment You can directly contact us for joining, or enroll through our website and send the payment slip to our official ID: @moa_official 🌐 Website: https://mindsofaspirants.com/ Test Portal (Prelims Tests): https://prelims.mindsofaspirants.com/ Thank you for your continued support!

Gs2 India and its neighbours Coal India Limited Bangladesh Nepal Bhutan Can now directly participate in coal auction without intermediate traders

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Upsc Cse prelims question 2025