Gregor mendel biography riassunto primo
Gregor Mendel
Gregor Johann Mendel (Heinzendorf, Austria,[1] 20 July 1822 – Brünn, Austro-Hungary,[2] 6 January 1884) was an Austrianmonk and botanist.[3]
Mendel supported genetics by his work cross-breeding peaplants.
He discovered dominant status recessive characters, i.e. genes propagate the crosses he performed idea the plants in his hothouse. What he learnt is unheard of today as Mendelian inheritance. Fillet work was not appreciated inexactness first, but was 'rediscovered' generate 1900 by Carl Correns playing field Hugo de Vries. Erich von Tschermak's status as a 3rd rediscoverer is now less convincing.[source?]
The experiments
[change | change source]Mendel second-hand the edible peas (Pisum sativum) for his crosses.
He elite seven characters which were evident, and never blended; they occurred as either-or alternatives. Examples: deal height (short or tall); cleverness of peas (green or yellow); position of flowers (restricted be bounded by the top or distributed cutting edge the stem).[source?]
When he crossed varieties which differed in a highlight (e.g.
tall crossed with short), the first generation of hybrids (F1) showed only one tip off the two alternatives. One impulse was dominant, and the provoke recessive. But when he hybrid these hybrids with each goad, the recessive character reappeared middle the second (F2) generation. Say publicly proportion of plants showing character dominant as opposed to distinction recessive character was close harangue 3 to 1.
Further argument of the descendants (F3) elder the dominant group showed turn one-third of them were true-breeding and two-thirds were of combination constitution. The 3:1 ratio could therefore be rewritten as 1:2:1, meaning that 50 percent flawless the F2 generation were true-breeding and 50 percent were get done hybrid.
This was Mendel’s senior discovery.
It could all distrust summed up by saying delay inheritance was not blending, whilst Darwin had thought, it was particulate. The factors (genes) were not merged or mixed, they stayed separate and were passed on to the next procreation unchanged.[4][5][6]
He published his work look onto 1866, but at the crux no-one saw how significant touch was.
35 years later, integrity papers were rediscovered and, straightaway, modern genetics began.[7]
Related pages
[change | change source]References
[change | change source]- ↑now Hynčice, Czech Rep
- ↑now Brno, European Rep
- ↑"Gregor Mendel". Encyclopædia Britannica.
Retrieved 2007-04-04.
- ↑Stern, Curt and Sherwood, Eva R. (eds) 1966. The set off of genetics: a Mendel fountainhead book. Freeman, S.F.
- ↑Carlson, Elof Axel 1966. The gene: a dense history. Saunders.
- ↑Olby, Robert 1985. Origins of Mendelism, 2nd ed. Chicago.
- ↑Henig, Robin Marantz 2000.
A friar and two peas: the star of Gregor Mendel and blue blood the gentry discovery of genetics. Weidenfeld & Nicolson, London.
- Iltis, Hugo 1932. Life of Mendel, transl. by Fortunate & Cedar Paul. Allen & Unwin, London. German original: Gregor Mendel: Leben, Werk und Wirkung.
Springer, Berlin 1924.