Evolution and Genetics
PART-A Unit-I: General Science
Previous Year Questions (PYQ) for this topic
Every TNPSC question asked from this topic, compiled as a PDF. · PDF 7.2 MB
Evolution & Genetics - PYQ Points
1. Evolution
- Theory of Use and Disuse: Proposed by Lamarck.
- Theory of Natural Selection: Proposed by Charles Darwin. He conducted his research in 1835 in the Galapagos Islands.
- Germplasm Theory: Proposed by August Weismann.
- Java Ape Man: The fossil Pithecanthropus erectus was discovered by Dubois.
- Mimicry: A phenomenon in which one organism resembles another to escape from predators.
- Hybrid: The cross between a horse and a donkey is called a Mule.
2. Genetics
- Father of Genetics: Gregor Mendel. The genotypic ratio of a monohybrid cross is 1:2:1.
- DNA Helicase: The enzyme involved in separating the two strands of DNA.
- Mutation: A sudden change occurring in genes or chromosomes.
- Polytene Chromosomes: First discovered in Chironomus.
- Genetic Drift: Also known as the "Sewall Wright Effect".
- Pleiotropy: A single pair of genes controlling multiple traits.
Important Scientists - Fields
| Scientist | Field / Contribution |
|---|---|
| Gregor Mendel | Genetics |
| Charles Darwin | Evolution |
| Robert Koch | Modern Microbiology |
| Claude Bernard | Physiology |
3. Chromosomes and
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