A female Drosophila fly is heterozygous for three recessive pigmentation mutatio

Question

A female Drosophila fly is heterozygous for three recessive pigmentation mutations called pl, wh, and tp pl is associated with purple eyes, wh is associated with white body, and tp is associated with transparent wings. A geneticist crosses this fly to a male purple, white, transparent fly and obtains 1000 progeny dist as follows. white wild type purple, transparent purple, white Number Phenotype 50 transparent 204 52 201purple Number 203 43 202 45 white, transparent purple, white, transparent Based on the data in this table, which genes are linked? O pl and tp O wh and tp O pl and wh Calculate the distance between the linked genes. m.u.

Explanation / Answer

Parental Combinations = 201 + 202 = 403

Parental Combinations = 203 + 204 = 407

Crossover = 45 + 52 = 97

Crossover = 50 + 43 = 93

Mapping Distance between Purple (pl) and Transparent (tp) = (97 + 93) / (403 + 407 + 97 + 93) X 100

                                                                                                            = 190 / 1000 X 100

                                                                                                            = 19 map units

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