# From Nuclein to CRISPR: A Journey of Genetics

> **Source:** [https://anjalipatel.org/from-nuclein-to-crispr-a-journey-of-genetics/](https://anjalipatel.org/from-nuclein-to-crispr-a-journey-of-genetics/)
> **Author:** [Anjali Patel](https://anjalipatel.org)
> **Published:** April 12, 2026
> **Reading Time:** 2 min
> 
> *This is the raw Markdown source of the article from the [Journal](https://anjalipatel.org/).*

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![Handwritten Chronology of Genetics](1-1.png)

This page shows the important milestones in the history of genetics and molecular biology, from 1869 to 2020. These discoveries did not happen suddenly. They took more than 150 years of observation, experiments, mistakes, and corrections.

In 1869, Friedrich Miescher discovered a substance called nuclein, which we now know as DNA. Later, Mendel explained inheritance using “factors,” even though genes were not yet known. Walter Sutton connected these factors with chromosomes, and Johannsen gave the term gene. William Bateson later introduced the word genetics.

With time, experiments became more precise. Griffith showed bacterial transformation, and Avery, MacLeod, and McCarty proved that DNA is the genetic material. Hershey and Chase confirmed this using radioactive isotopes. Chargaff explained base pairing rules, and Watson and Crick, supported by Rosalind Franklin’s X-ray diffraction data, described the double helical structure of DNA.

After understanding DNA structure, scientists started working on gene function and control. The genetic code was cracked by Nirenberg and Khorana. Jacob and Monod explained gene regulation through the lac operon model. Sydney Brenner showed that genetic information is read in triplet codons.

Later, biology entered the manipulation phase. Paul Berg developed recombinant DNA technology. Cohen and Boyer achieved gene cloning. Fred Sanger introduced DNA sequencing. Kary Mullis developed PCR, which made DNA amplification fast and easy. Ian Wilmut cloned Dolly the sheep, proving that adult cells can be reprogrammed.

The Human Genome Project gave us the complete human DNA sequence. CRISPR-Cas9 then allowed precise gene editing. Recently, mRNA technology showed how gene expression can be used in modern medicine.

This journey shows how biology moved from discovering genes to editing genes. It also reminds us that increasing power comes with increasing responsibility.

#Genetics #MolecularBiology #Biotechnology #LifeSciences #StudentOfScience