Explanation Needed Please Use the following information for questions 1-6. The w

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Explanation Needed Please

Use the following information for questions 1-6. The wild-type phenotype in drosophila is non-striped thorax, non-hairy body and dark red eyes. A drosophila female with striped thorax, hairy body and sienna eyes was crossed with a normal male. In the F1 generation, both male and female progeny were normal. An F1 female was test-crossed to a multiply homozygous (or possibly hemizygous) recessive tester male fly, and produced the following progeny (840 total):

38 striped only                          47 sienna, hairy       39 sienna only                                  44 striped, hairy

164 wild-type         159 hairy only          172 striped, sienna, hairy                     177 striped, sienna

Which mutant allele(s) in this case, if any, is dominant to its respective wild-type allele?

Striped thorax            b. hairy body                        c. sienna eyes

d.     all of the above (a-c) are dominant   e. none of the above (a-c) are dominant

Which mutant allele(s) in this cross, if any, is/are x-linked?

Striped thorax            b. hairy body                        c. sienna eyes

d.     all of the above (a-c) are dominant   e. none of the above (a-c) are dominant

What is the correct gene order for these data?

Striped-sienna           b. striped-hairy-sienna                                     c. sienna-striped-hairy

d.    Striped-sienna-hairy                e. striped-hairy

What is the total length of the map in question 3?

16.8                 b.20.0                      c.56.8                       d.67.6                      e. no linkage

What are the values of chi-square and degree of freedom for fit to expected Mendelian proportions in the above cross?

a.    481 with 8df                 b. 481 with 7 df                   c. 304 with 7 df                  

d.    304 with 8 df                e. none of the above

Which of the following five flies is herterozygous for all mutants involved in this experiment?

Original parent female with striped thorax, sienna eyes and hairy body

Original parent male

Triple mutant (striped, sienna, hairy) in the test cross generation

Completely wild-type flies in the test cross generation

Tester male fly

Explanation / Answer

1)e. (none of the above a,-c are dominant)

2)d,c,b,a,e

3)b(20.0)

4)d(304 with 8df)

5)b

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