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Question: 1 in fruitflies scarlet eyes s is autosomally recessive to...

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1. In fruitflies, scarlet eyes (s) is autosomally recessive to wild-type color; ebony body is autosomally recessive to wild-type body. The traits are located on the 3rd chromosome & are 26 cM apart. A wild-type female is test-crossed (see cross below). Based upon the information given, complete the chart.

                                                                                                            P:          s           +          X          s           e

                                                                                                                        +           e                      s           e

            Genotype             Phenotype                    Expected %         

Total: 100%

                                               

PHENOTYPE

EXPECTED FREQUENCY

OBSERVED FREQUENCY

(O – E)

(O – E)2

(O – E)2/E

Wild-type for both traits

90

scarlet & ebony

85

Scarlet & wild-type body

275

Wild-type eyes & ebony

300

Total

750 total flies

750 total flies

X2 =

x^2= e(O-E)^2/E

Degrees of freedom (n) 5% Probability Value (P)
1 3.84
2 5.99
3 7.81
4 9.49

   What are your degrees of freedom for this question? ___________                                (n = phenotypes -1 )

  

Does the data fit the hypothesis/expected (have a X2 value < 5% P value for that n)?

_______________

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