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ps6q - MIT Department of Biology 7.014 Introductory Biology...

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MIT Department of Biology 7.014 Introductory Biology, Spring 2004 Name:__________________________________________ Section: ______ 7.014 Problem Set 6 Please print out this problem set and record your answers on the printed copy. Problem sets will not be accepted late. Question 1 a) Define the following terms: Dominant – Recessive – Phenotype – Genotype – Alleles – Homozygous – Heterozygous – Mendel’s First Law – Mendel’s Second Law – Sex-Linked – Haploid – Diploid – 1
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Name:__________________________________________ Section: ______ Question 1, continued b) One summer, you decide to become an UROP student for a professor who studies the genetics of corn, Zea mays . When you cross the following a true-breeding strain of corn with purpled, smooth kernels to a true-breeding strain of corn with yellow, wrinkled kernels you find that the F 1 progeny all have purple, smooth kernels. You then cross two F 1 progeny and see the following in the F 2 generation. P 0 Phenotype P 0 Genotypes** Purple, Smooth Kernels Yellow, Wrinkled Kernels F 1 Phenotype F 2 Genotype** Purple, Smooth Kernels F 2 Phenotypes* # of F 2 Progeny F 2 Genotypes** Yellow, Wrinkled Kernels 56,251 Yellow, Smooth Kernels 167,879 Purple, Smooth Kernels 508,746 Purple, Wrinkled Kernels 170,435 i) Does the pattern above indicate a Mendelian method of inheritance for the traits of kernel color and kernel texture? Explain. ii) Kernel color is encoded by gene A , where A is associated with the dominant phenotype and a is associated with the recessive phenotype. Similarly, kernel texture is encoded by gene B , where B is associated with the dominant phenotype and b is associated with the recessive phenotype. Indicate the genotype(s) for each of the corn plants in the above boxes under Genotypes **. 2
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Name:__________________________________________ Section: ______ Question 1, continued c) You are unsure of the genotype of an individual F 2 corn plant (from Part b) that has purple, smooth kernels and would love to know its genotype. i) What cross would allow you to determine the genotype of the purple, smooth corn plant? ii) Describe the four different possible scenarios from your cross above. Indicate phenotypes and genotypes. Question 2 The fruitfly Drosophila melanogaster has been a focus of genetic studies since the early twentieth century with the pioneering experiments of Thomas Hunt Morgan. It is a good system for genetic studies because of its small size, ease of cultivation, and short generation time.
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