# You conduct a QTL experiment to find the loci controlling fruit size and sugar content starting...

###### Question:

You conduct a QTL experiment to find the loci controlling fruit size and sugar content starting from two parental varieties, “Sam’s Giant (SG)” and “Sweet Baby Red (SBR)”. Your cross “Sam’s Giant” and “Sweet Baby Red” and generate F1’s and then interbreed F1’s to generate a series of F2 individuals and measure size and sugar content in all of them. You determine the genotype at many individual SNP markers, 5 of which (each on a different chromosome) are shown below. The data are:

1. Which, if any, of the SNPs are associated with fruit size? Explain
2. Which, if any, of the SNPs are associated with sugar content? Explain
3. What do the results from parts a and b say about the two traits (fruit size and sugar content)?
Type SNP A SNP B SNP C SNP D SNPE Fruit size (g) 740 AA CC SG SBR F1 F21 F22 F23 F24 F25 F26 F27 F28 320 540 670 650 590 570 550 530 500 460 Sugar content (mg/G tissue) 12 39 24 18 22 24 26 29 32 34 37 AC AC CC АА CC АА AC CC AC IT GG TG TT TT TG TG TG GG GG GG GG AA GA GA GG AA GA GA GG AA GA AA CC AC AC CC AA AC АА CC АА AC CC TT СТ CC CC СТ СТ TT TT TT TT

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