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?

Expert Solution

gladiator answered 1 year ago

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