DNA history DNA double helix https://www.youtube.com/channel/UC7iYOR5IgfGMuwd_GwalglA

1. DNA
DNA

2. Discovery
Begining
Gregor Mendel
Gregor Johann
Mendel (/ˈmɛndəl/; Czech: Řehoř Jan
Mendel;[2] 20 July 1822[3] – 6 January 1884) was
a meteorologist,[4] mathematician,
biologist, Augustinian friar and abbot of St.
Thomas' Abbey in Brno, Margraviate of Moravia.
Mendel was born in a German-speaking family
in the Silesian part of the Austrian
Empire (today's Czech Republic) and gained
posthumous recognition as the founder of the
modern science of genetics.[5] Though farmers
had known for millennia that crossbreeding of
animals and plants could favor certain
desirable traits, Mendel's pea plant experiments
conducted between 1856 and 1863 established
many of the rules of heredity, now referred to as
the laws of Mendelian inheritance.

3. DNA
DNA

4. Friedrich Miescher
Extract DNA from WBC nucleus

5. DNA

6. Albrecht Kossel
• who is credited with naming
DNA, identified nuclein as a
nucleic acid. He also isolated
those five nitrogen bases that
are now considered to be the
basic building blocks of DNA
and RNA: adenine (A), cytosine
(C), guanine (G), and thymine
(T) (which is replaced by uracil
(U) in RNA).

7. mitosis
Walther
Fleming

8. • Early 1900s — Theodor Boveri
and Walter Sutton were
independently working on
what’s now known as the
Boveri-Sutton chromosome
theory, or the chromosomal
theory of inheritance. Their
findings are fundamental in our
understanding of how
chromosomes carry genetic
material and pass it down from
one generation to the next.
chromosomal theory
of inheritance

10. Rosalind Franklin
• 1951 — Roslin Franklin’s work in X-ray
crystallography began when she started
taking X-ray diffraction photographs of DNA.
Her images showed the helical form, which
was confirmed by Watson and Crick nearly
two years later.

11. Rosalind Franklin
Rosalind Elsie Franklin (25 July
1920 – 16 April 1958)[1] was an
English chemist and X-ray
crystallographer whose work was
central to the understanding of the
molecular structures
of DNA (deoxyribonucleic
acid), RNA (ribonucleic
acid), viruses, coal,
and graphite.[2] Although her works on
coal and viruses were appreciated in
her lifetime, her contributions to the
discovery of the structure of DNA were
largely unrecognized during her life, for
which she has been variously referred
to as the "wronged heroine",[3] the
"dark lady of DNA",[4] the "forgotten
heroine",[5] a "feminist icon",[6] and the
"Sylvia Plath of molecular biology".[7]

12. Watson and Crick
1953 — Watson and
Crick published on
DNA’s double helix
structure that twists to
form the ladder-like
structure we think of
when we picture DNA