ou will be given germinated corn kernels to score seedling traits depicted in the table abo ction: What phenotypic ratios do you expect in the following dihybrid cross, base Hel's Laws and the location information provided? You should predict the expected separately (e.g. seedling color or plant height) and then the two loci together (e.g. the phenotypes for the LW3/lw3 and D5/d5 loci together). Also predict the phenotype types of the inbred parents of the F1 (The inbred parents of this generation are o 2)
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The traits are seedling color (LW3/lw3) and plant height (D5/d5). The alleles for seedling color are LW3 (dominant) and lw3 (recessive), and the alleles for plant height are D5 (dominant) and d5 (recessive). Show more…
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Suman K.
Mendelian Genetics. Mendelian traits are controlled by a single gene with exactly two (2) alleles. One allele is dominant and the other allele is recessive. Dominant alleles are represented by capital letters while recessive alleles are represented by the corresponding lower-case letter. Actual letter choices are a matter of personal preference but the convention is to use the first letter of the dominant trait. Question #1: In the pea plants that Mendel worked with, tall stems are dominant over short stems. This trait displays complete dominance. Tall stem allele = T Short stem allele = t If you cross a homozygous dominant tall plant with a short plant, what will the predicted phenotypic and genotypic ratios be for the F1 offspring be? First write out the genotypes of the parent plants and then complete the Punnett square. Then answer the question. Question #2: Suppose two of the F1 offspring are allowed to self-pollinate. What will the predicted phenotypes and genotypes of the F2 generation be? Complete the Punnett square on the next page.
Sri K.
Two different pure-breeding lines of corn were obtained with a tester that was homozygous recessive for the three genes. The parentals shriveled (sh/sh. br+/br+. f+/f+) and brown and fine (sh+/sh+. br/br. f/f) were crossed. The F1 was wildtype. The F1 was testcrossed (sh/sh. br/br. f/f) and the following F2 progeny was obtained: 3601 shriveled; 3713 brown and fine; 1021 brown; 865 fine and shriveled; 453 shriveled and brown; 333 fine; 6 wildtype; 8 shriveled, brown and fine. a. Write out the genotypes and phenotypes of the crosses. Include P, F1 and F2 generations and correct nomenclature (e.g. linked/unlinked, gene order). b. Draw a table including each of the F2 phenotypic classes and identify, for each pair of gene loci (3), the parentals and recombinants. Identify the double recombinants. c. Determine the gene order of the loci, calculate the map distances between the loci and draw a recombination map. You must show all calculations.
Supreeta N.
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