Select an ear of corn to work with Determine what kind of cross produced your

Select an ear of corn to work with determine what

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Select an ear of corn to work with. Determine what kind of cross produced your ear of corn by counting the number of purple and yellow kernels. Record your count of each of 12 rows in the table below. DO NOT PICK OFF THE KERNELS FROM THE EAR OF CORN! Kinds of grains Number in each row 1 2 3 4 5 6 7 8 9 10 11 12 Purple Nonpurple (yellow) a) What percent of the seeds were purple? ______ b) What percent of the seeds were non-purple? ______ c) What is the inferred ratio of purple : non-purple seeds? _______________ d) Based on this ratio, what are the genotypes of the parent corn plants which were crossed to obtain your ear of corn? (P=purple; p=non-purple) _____&_____ Summary Questions 1) Briefly define each of Mendel’s Principles that have been demonstrated in the crosses you have completed in this investigation. Principle of Dominance: ___________________________________________________ _______________________________________________________________________ Totals _____ _____
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4 Principle of Unit Characters (factors): _______________________________________ ______________________________________________________________________ Principle of Independent Assortment: ________________________________________ _______________________________________________________________________ 2) In a cross of two individuals in which both are heterozygous, for a single trait, what genotypic and what phenotypic ratios would be obtained? _______________________ _______________________ 3) What phenotypic ratio is obtained when individuals that are heterozygous for two traits are crossed? ________________ 4) Explain if the Principle of Independent Assortment would apply if the genes for coat color and gait in horses were carried on the same chromosomes. __________________ ________________________________________________________________________ ________________________________________________________________________ 5) On the basis of your results in this lab, explain how genetic principles can yield predictable results. _______________________________________________________ ________________________________________________________________________ ________________________________________________________________________
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