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Revision 2 for quantitative genetics : 2019 Week 1 1a. 1b. There are few assumption when you do quantitative genetics. Describe at least THREE (3) assumptions that you need to make. A study of a vole population measured tail length of a number of individuals. What is the mean tail length of the voles analyzed in this study? Individual 1: 1.4 cm Individual 2: 1.6 cm Individual 3: 1.2 cm Individual 4: 1.5 cm Individual 5: 0.9 cm Individual 6: 1.2 cm (3 marks) Week 2 2a.Dalam data kuntitatif, varians fenotip dalam populasi yang mempunyai kepelbagaian genetik boleh dibahagikan kepda empat komponen. Apakah komponen itu? In quantitative data, phenotypic variance of genetically variable populations can be divided into four components. What are the components? (5 markah/marks) b. .The narrow sense heritability for potato weight in a starting population of potatoes is 0.42, and the mean weight is 1.4 lb. If a breeder crosses two individuals with average potato weights of 1.9 and 2.1 lb, respectively, what is the predicted average weight of potatoes in the offspring? Week 3 3. 3 a. Compare and contrast mass selection and individual selection ( 4 marks) b. Explain progeny test Week 4 4a Describe the difference between narrow sense and broad sense heritability . ( 4 marks) 4b. Phenotypic variation in the diameter of fruit of a commercially viable plant was analyzed with the following results: VA = 1.7 VD = 1.2 VI = 1.3 VE = 1.3 Calculate the broad-sense heritability and the narrow-sense heritability for this trait. Considering the commercially viable fruit assessed above, predict how accessible it is to artificial selection. Which measure of heritability will be the most useful in assessing the potential for artificial selection? ( 5 marks) Week 5 5a) Tunjukkan dengan menggunakan gambarajah, rekabentuk kajian yang disebutkan dibawah. Terangkan. Illustate with diagrams, the experimental design mentioned below. Explain i) Silang dialel dan separa dialel Diallele cross and partial diallele cross (10 markah/marks) ii) Kemampuan Pergabungan Pergabungan Am (GCA) Khusus (SCA) dan Kemampuan Specific Combining Ability (SCA) and General Combining Ability (GCA) Week 6 6a. Banding dan bezakan depresi pembiakan dalam dengan heterosis. Compare and contrast inbreeding depression and heterosis. (5 markah/marks) b. This can also be be accomplished by acquiring fish from another hatchery and by making hybrids. If the fish from the two hatcheries are unrelated, what will b einbreeding coeefient of F1 hybrids? . In fact, many hybrid seeds that are produced commercially are produced by crossbreeding highly inbred, but unrelated, lines. This reduces inbreeding to zero in the plants that will be grown and also produces some hybrid vigour, as well as uniform crops.Calculate the inbreeding coefficient of J an U? (5 markah/marks)