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Download Gregor Mendel and His Peas: Gregor Mendel was an Austrian monk
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Transcript
Gregor Mendel and His Peas: Gregor Mendel was an Austrian monk who discovered patterns of inheritance in plants. Though his work was initially ignored during his lifetime, he was eventually dubbed the “Father of Genetics” and his work was built upon to discover causes of hereditary disorders and to improve crop yields in plants. Mendel’s classic first experiment was a cross between plants that were homozygous dominant and plants that were homozygous recessive (purebred). Complete the table and questions below then, analyze the image and describe the process and outcome of Mendel’s experiment in the space provide. Complete the Chart Homozygous Dominant Parent Parent Genotype Phenotype Generation Homozygous Recessive Parent Genotype Phenotype Why are all the F1 offspring heterozygous? What do they look like? What are the chances of smooth peas in the F2 generation? ____________ What are the chances of wrinkled peas in the F2 generation? ___________ S = smooth s = wrinkled ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ Image source: http://www.accessexcellence.org/RC/VL/GG/mendel.html ___________________________________________ Testing Mendel: To test Mendel’s results you will be looking at a sample of Wisconsin Fast Plants (Brassica rapa). These plants carry with them the genes for Anthocyanin, a common purple pigment. When this gene is turned on, the color can be easily observed in the plants stems. If the plant is heterozygous or homozygous dominate for the gene, the purple stem will be displayed. If the plant is homozygous recessive for the gene, a green stem will be displayed. Complete the following crosses and determine the percentage of each of the possible genotypes and phenotypes. P P P p P p P p P p P p p p p Genotype Percentage PP Pp pp Genotype Percentage PP Pp pp Test it: 1. Record sample number (petri dish number) Genotype Percentage PP Pp pp P Genotype Percentage PP Pp pp :____________________ 2. Count the number of green stems and record: _____________________ 3. Count the number of purple stems and record: _____________________ Analyze and Interpret: 1. When finished with counting your seedlings, enter your data into the Google formed linked under “Today in science”. 2. Once all data as been collected, analyze the numbers and determine the percentage of each of the phenotypes (green vs. purple). Purple stems: ______ out of _______ or _________% Green stems: ______ out of _______ or _________% 3. What is the genotype of the offspring with green stems? What are the possible genotypes of the offspring with purple stems? Green:_________________________ Purple: _________________________ 4. What are the genotypes of the parents? How do you know?
