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In the fruit fly, Drosophila melanogaster, a wingless female fly is mated to a male that...

In the fruit fly, Drosophila melanogaster, a wingless female fly is mated to a male that is white-bodied and legless. Assume that all alleles causing these phenotypes are recessive. Phenotypically wild-type F1 female progeny were mated to fully homozygous (mutant) males, and the following progeny were observed:

Phenotypes Number Observed

wingless                           324

wild-type                             34

white, wingless                 135

white                                   8

white, legless                   319

hairless, white, legless     32

hairless                              140

hairless, legless               9

(a) With respect to the three genes mentioned in the problem, what are the genotypes of the homozygous parents used in making the phenotypically wild-type F1 heterozygote?

(b) Which gene is in the middle?

(c) What are the map distances for the three genes? A correct formula with the values "plugged in" for each distance will be sufficient.

(d) What is the coefficient of coincidence? A correct formula with the values "plugged in" will be sufficient.

(e) What is the value for interference? Is there positive, negative, total, or no interference?

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