It is also possible to analyze the dihybrid cross with a Punnett\'s square. For

Question

It is also possible to analyze the dihybrid cross with a Punnett's square. For a dihybrid cross, we'll need a 4 x 4 grid because there are four genotypes in the Fi gametes. Here is the Punnett's square analysis of the Fi cross from the above example. F1 cross- Rr Tt x Rr Tt R T r T RR Tt Rr TT Rr Tt R T RR Tt Rr Tt Rr tt Rt IL rr Tt r t Rr Tt Rr tt rr Tt 16) Using what you have learned about Mendel's law of random segregation and independent assortment, why are all possible combinations of genes used in the dihybrid Punnett's square? In other words, along the top and side of the above Punnett's square, every possible combination of genes from each of the parents (Fi) is represented. Why is this necessary? What does it account for? 17) What are the phenotypic and genotypic ratios of the F2 offspring from the above crosses? 18) Construct a dihybrid Punnett's from the above example. What are the phenotypic ratios of the F2 offspring? square for Fi parents with genotypes different (your choice) 19, n front of you there is offspring (#3) from the F1 parents of a dihybrid cross. Using a chi uare test, and what you have learned about Mendel's laws, determine the genotype and phenotypes of the Fi parents. To answer this question properly, you will need to construct a chi-square table and determine your expected and observed values for each phenotype. In addition you need to correctly identify your null and alternative hypotheses when conducting the chi-square test

Explanation / Answer

17) Phenotypic ratio will be 9:3:3:1 in a Mendelian dihybrid cross.

Genotypic ratio will be 1:2:1:2:4:2:1:2:1 in a Mendelian dihybrid cross.

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