Introduction to Genetic Analysis 149

Introduction to Genetic Analysis 149 - 44200_04_p115-150...

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441 x ± ² y ² z ± males, 39 x ² y ² z males, 32 x ± ² y ± ² z males, 30 x ± ² y ± ² z ± males, 27 x ² y ² z ± males, 1 x ± ² y ² z male, and 0 x ² y ± ² z ± males. a. On what chromosome of Drosophila are the genes carried? b. Draw the relevant chromosomes in the heterozy- gous female parent, showing the arrangement of the alleles. c. Calculate the map distances between the genes and the coefficient of coincidence. 34. From the five sets of data given in the following table, determine the order of genes by inspection— that is, without calculating recombination values. Recessive phenotypes are symbolized by lowercase letters and dominant phenotypes by pluses. Phenotypes observed in 3-point testcross 1 2 3 4 5 111 317 1 30 40 305 11 c 58 4 6 232 0 1 b 1 10 31 339 84 28 1 bc 2 77 137 201 107 a 0 77 142 194 124 a 1 c 21 31 291 77 30 ab 1 72 4 3 235 1 abc 203 1 34 46 265 Data sets 35. From the phenotype data given in the following table for two three-point testcrosses for (1) a , b , and c and (2) b , c , and d , determine the sequence of the four genes
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