Heredity and Evolution
1. Introduction to Heredity
Heredity is the biological process by which physical or mental characteristics are passed
from one generation to another through genes.
Key Historical Milestones
* Johann Gregor Mendel (1886): Recognized as the "Pioneer of Modern Genetics." He spent
years researching how traits are inherited.
* Hugo de Vries (1901): Proposed the Mutation Theory to explain sudden changes in
hereditary traits.
* Walter and Sutton (1902): Observed paired chromosomes in grasshopper cells, linking
chromosomes to heredity.
* Avery, McCarty, and MacLeod (1944): Proved that DNA is the genetic material in all living
organisms (except some viruses).
* Jacob and Monad (1961): Proposed the model for protein synthesis in bacteria, which
laid the foundation for Genetic Engineering and recombinant DNA technology.
Importance of Heredity Science
* Diagnosis: Identifying genetic disorders early.
* Treatment: Managing hereditary conditions.
* Prevention: Preventing the transmission of disorders to offspring.
* Agriculture/Industrial: Creating hybrid varieties of plants/animals and using microbes in
industrial processes.
2. The Central Dogma
The Central Dogma is the process by which the information in DNA is converted into a
functional product, like a protein. This flow of information follows this path:
DNA mRNA Protein
The Three Stages of Protein Synthesis
A. Transcription (The "Scripting" Phase)
This occurs inside the nucleus.
