Discussion Section michelle wk 5

# O genotypic ratios versus phenotypic ratios o

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o Genotypic ratios versus Phenotypic ratios o Multiplication Rule à “and” o Addition Rule à “either/or” o Dihybrid Cross = crossing with account of 2 different genes What kind of gametes would you have if you were crossing AaBb x AABb? Draw the dihybrid cross for this situation. Give the genotypic ratios. t T Homologous pair a

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BICD 100 Genetics – Ghiara Spring 08 Week5 o Branch Diagram: used to get probabilities for dihybrid crosses 1. do a separate punette square for each gene. 2. find the phenotypic ratios 3. choose one characteristic (ex. Seed shape) and multiply it by the probabilities of the characteristics (ex. Seed color) o Give an example of a dihybrid test cross : ______________________________ Incomplete Dominance = when 2 alleles are not completely dominant over the other; a heterozygous phenotype results as a “blending” of alleles. o Examples: Hair: S = Straight; C = Curly SS = Straight hair; SC = Wavy hair; CC = Curly hair Roses: R = Red; W = White RR = Red petals; RW = Pink petals; WW = White petals Probability and Binomial Expansion o Binomial Expansion: Quick Method: A_B_ A_bb aaB_ aabb A b B Unlinked genes (a + b) n
BICD 100 Genetics – Ghiara Spring 08 Week5 a = probability of recessive b = probability of dominant n = total number of individuals considering (how many kids there are) coefficient = the total number of ways you can arrange that specific term/situation (Ex. How many ways you can have 1

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