1. Origins of Modern Genetics ► Jean Baptiste Lamarck (French, early 19 th c.): “The Inheritance of Acquired Characteristics” ► Charles Darwin (English, 1859): Species can change through the process of natural selection ► Gregor Mendel (Austrian, 1865): Founder of modern genetics; Experimental discovery of inheritance of traits from one generation to the next; genes as material foundation of heredity

2. Jean B. Lamarck (1744-1829)

3. Charles Darwin (1809-1882)

4. Gregor Mendel (1822-1884)

5. Modern Genetics ► Thomas Morgan (1866-1945): Located genes at chromosomes and developed modern genetics through experiments on Drosophila—fruit flies ► Oswald Avery (1877-1955) and colleagues: Discovered in 1944 that DNA was the molecule that contained genetic information

6. Thomas Morgan (1866-1945)

7. Oswald Avery (1877-1955)

8. Watson and Crick ► James Watson (1928-) and Francis Crick (1916-2004): “Cracked” the molecular structure of DNA and explained how the genetic codes were transferred from one generation to another. ► Maurice Wilkins (1916-2004) and Rosalind Franklin (1920-1958): made the crucial contributions to Watson and Crick with their crystallography of DNA

9. James Watson

10. Francis Crick

11. Rosalind Franklin

12. Maurice Wilkins

13. Issues to Consider ► Modern science as interdisciplinary ► Biology and physics ► Importance of being at a center of scientific communication ► Styles of scientific research ► Gender and science