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Question: 2 in flies smooth abdomens s is autosomally recessive to...

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2. In flies, smooth abdomens (s) is autosomally recessive to wild-type abdomens; brown eyes (b) are autosomally recessive to wild-type eyes. The traits are 10 cM apart and both on the 2nd chromosome.

Wild-type female is test-crossed and the following offspring frequencies are obtained:

            Mother’s         ___________             X          Father’s           s           b                                             

            Genotype:                                                      Genotype:      s           b

    Genotype                             Phenotype                        Expected %    Expected #

wild-type

for both traits

45%

wild-type abdomen

& brown eyes

5%

smooth abdomen

& brown eyes

45%

smooth abdomen

& wild-type eyes

5%

Total: 100%

   1000 flies

3. In flies, curly wings (C) is autosomally dominant; aristaless antenna (a) is autosomally recessive. The traits are 6 cM apart and both on 3rd chromosome.

A Curly female is test-crossed and the following offspring frequencies are obtained:

            Mother’s         ___________              X          Father’s           +          a                                             

            Genotype:                                                      Genotype:      +          a

Genotype                                Phenotype                        Expected %    Expected #

Curly wings

47%

aristaless antenna

47%

wild-type

3%

Curly wings

& aristaless antenna

3%

Total: 100%

800 flies

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