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PLC 16 - Assessed Task Unit No. Topic Area Key Concept Simple Inheritance in Plants and Animals Mendels Experiments Name: 2 Difficulty Class: 1. In the 1850s, Gregor Mendel carried out breeding experiments using peas. (a) The importance of Mendel’s work was not recognised until the early 1900s. Explain why. .................................................................................................................................... .................................................................................................................................... .................................................................................................................................... .................................................................................................................................... (2) (b) A student repeated one of Mendel’s experiments. The flow chart shows her procedure. St Peter’s Catholic Comprehensive School – Science Department 2013 (ii) Describe how the student could obtain a representative sample of seeds produced by the second generation ……………………………………………………………………………………………………………………. …………………………………………………………………………………………………………………. What is the approximate ratio of green seeds to yellow seeds in second generation ………………………………………………………………………………………………………………(2) (iii) Seed colour in peas is controlled by a single gene which has two alleles. Use a genetic diagram to show why this ratio of yellow seeds to green seeds was produced by the second generation. Use the symbol A to represent the dominant allele, and a to represent the recessive allele. (4) (Total 8 marks) 2.Gregor Mendel reached important conclusions please say which two of these statements about his Conclusions and life are true 1. 2. 3. 4. 5. Heredity units are passed on from one parent only The dominant unit will be not expressed if the recessive one is present An heredity unit can be dominant or recessive Heredity units are now called genes. Mendel was treated as a great hero due to his discoveries. Total Score Out of: Percentage Score TIP – To Improve Progress How you can make further progress 0-39% = Practice Task 1 40-79% = Improvement Task 1 80%+ = Extension Task 1 St Peter’s Catholic Comprehensive School – Science Department 2013