Three point crosses.docx

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Department
Biological Sciences
Course
BIO SCI 97
Professor
Rahul Warrior
Semester
Fall

Description
Three point crosses Nonmenclature • Wildtype alleles can be shown as “+” • Wildtype dominant alleles can be shown with a capital letter lz su Gl Lz su Gl • Alleles can be given on a gene by gene basis: lz/Lz su/su Gl/Gl • You need to be familiar with all of the above, and comfortable combining them • Three point crosses give us information about crossover interference: • We know how frequently one crossover occurs in the first interval: f_1 • We know how frequently one crossover occurs in the second interval: f_2 • We know how frequently one crossover occurs simultaneously in each interval: f_3 • Without interference, f_3 = f_1 * f_2 because the events are independent • So we measure interference by the
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