In the fruit fly, Drosophila melanogaster, a spineless (no wing bristles) female fly is mated to a male that is claret (dark eyes) and hairless (no thoracic bristles). Phenotypically
wild -type F1 female progeny were mated to fully homozygous (mutant) males, and the following progeny (1000 total) were observed:
a() Which gene is in the middle?
b() 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?
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.

Question

In the fruit fly, Drosophila melanogaster, a spineless (no wing bristles) female fly is mated to a male that is claret (dark eyes) and hairless (no thoracic bristles). Phenotypically
wild -type F1 female progeny were mated to fully homozygous (mutant) males, and the following progeny (1000 total) were observed:
  a() Which gene is in the middle?
b() 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?
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.

Quizplus · Accepted Answer

The Answer of In the fruit fly, Drosophila melanogaster, a spineless (no wing bristles) female fly is mated to a male that is claret (dark eyes) and hairless (no thoracic bristles). Phenotypically
wild -type F1 female progeny were mated to fully homozygous (mutant) males, and the following progeny (1000 total) were observed:
  a() Which gene is in the middle?
b() 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?
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.

In the Fruit Fly, Drosophila Melanogaster, a Spineless (No Wing