Showing posts with label Gregor Mendel. Show all posts
Showing posts with label Gregor Mendel. Show all posts
Wednesday, July 20, 2011
Tuesday, July 19, 2011
Gregor Mendel peas
In one experiment, Mendel cross-pollinated smooth yellow pea plants with wrinkly green peas. (The organisms that are used as the original mating in an experiment are called the parental generation and are marked by P in science textbooks). Every single pea in the first generation crop (marked as f1) was as yellow and as round as was the yellow, round parent. Somehow, yellow completely dominated green and round dominated wrinkly.
Mendel learned from this that there are two kinds of traits - dominant and recessive. In this case, the dominant traits are the yellow color and the round shape since they show up at the expense of the green color and the wrinkly shape. He also learned that the inheritance of each trait is determined by "units" or "factors" - now called genes.
Gregor Mendel peas
Gregor Mendel peas
Gregor Mendel peas
Gregor Mendel peas
Gregor Mendel's 189th Birthday
Gregor Mendel's 189th Birthday
Gregor Mendel's 189th Birthday
Gregor Mendel's 189th Birthday
Gregor Mendel
Gregor Johann Mendel (July 20, 1822 – January 6, 1884) was a Czech-German Augustinian friar and scientist, who gained posthumous fame as the founder of the new science of genetics for his study of the inheritance of certain traits in pea plants. Mendel showed that the inheritance of these traits follows particular laws, which were later named after him. The significance of Mendel's work was not recognized until the turn of the 20th century. The independent rediscovery of these laws formed the foundation of the modern science of genetics.
Gregor Mendel
Gregor Mendel
Gregor Mendel
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