Gregor Mendel (1822-1884) The Father of Genetics Mendelian Genetics 2/16/2019 Gregor Mendel (1822-1884) The Father of Genetics This has been modified from the original ppt Oct. 2011 copyright cmassengale

Gregor Johann Mendel Austrian monk Mendelian Genetics 2/16/2019 Gregor Johann Mendel Austrian monk Studied the _________ of traits in _______________ Developed the ______________________________________ Mendel's work was not recognized until the turn of the ___________________

copyright cmassengale Mendelian Genetics 2/16/2019 Gregor Johann Mendel Between 1856 and 1863, Mendel cultivated and tested thousands of pea plants He found that the plants' offspring retained traits of the parents copyright cmassengale

Particulate Inheritance Mendelian Genetics 2/16/2019 Particulate Inheritance Mendel stated that physical traits are inherited as “_______________” Mendel did not know that the “particles” were actually ____________________________________________ copyright cmassengale

copyright cmassengale Mendelian Genetics 2/16/2019 Why peas, Pisum sativum? Can be grown in a ____________________ Produce ___________ Produce ___________ plants when allowed to ____________________ several generations Can be ________________________________________ copyright cmassengale

Mendel and His Peas Mendel tested 7 traits: Flower color Flower position Seed color Seed shape Pod shape Pod color Plant height http://www.fieldmuseum.org/exhibits/traveling_mendel.htm

Mendel and His Peas Mendel crossed flowers that were true-breeding for each characteristic. He crossed a purple (PP) flowered plant with a white (pp) flowered plant. (_______________________________) http://biology.kenyon.edu/courses/biol114/KH_lecture_images/Mendel/Mendel.html

Mendel and His Peas Purple Parent (PP) The __________ (F1) of plants all had purple flowers. Where did the white color go?? White Parent (pp)   (Pp)    (Pp)    (Pp)

Mendel and His Peas Mendel took two of his first generation (F1 x F1) purple flowered plants and crossed them together. In the second generation (F2) he had 3 purple flowered plants, and 1 white flowered plant. Purple Parent (Pp) Purple Parent (Pp)    (PP)   (Pp)   (Pp)   (pp)

Mendel and His Peas Mendel noticed in the first generation, all of the white flowers seemed to disappear. He called this a ____________________. The white color faded into the background at first. It showed up in the next generation when he pollinated the flowers.

Mendel and His Peas The color (purple) that seemed to mask over the recessive color was named the ________________________________.

Mendel and His Peas Mendel was responsible for figuring out that each plant carried ______ sets of instructions for each characteristic (one from the “_____” and one from the “____” Like many scientists, his work was not accepted until after his death.

Let’s Review 1. If you crossed a true-breeding black rabbit with a true-breeding white rabbit, all of the offspring would be black. Which trait is dominant in rabbits: black fur or white fur? 2. Which trait is recessive?

Answer Black Rabbit (BB) The trait for black fur is _________ over the trait for white fur. The white fur trait is ______________. White Rabbit (bb)   (Bb)   (Bb) http://www.buckeyevalleyfarms.freeservers.com/photo.html