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A series of two point crosses is carried out between genes for brown eyes (bw), and arc wings (a), vestigial wings (vg) , ebony body color (e), and curved wings (cv). The following number of nonrecombinant (NR) and recombinant progeny (R) were obtained from each cross.

Genes in cross Progeny (NR) Progeny (R)
a,bw 2224 117
a,cv 2609 823
a,e 3200 3200
a,vg 5172 2379
bw,cv 4614 1706
bw,e 4150 4150
bw,vg 2796 1434
cv,e 3116 3116
cv,vg 2102 305
vg,e 4559 4559


Required:
Using these data form two-point crosses, create a genetic map for these genes, providing the order of the genes and your best estimates of the distances between them.

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Answer:

Order of genes: Vg---cv--a---bw---e

Distances among linked genes:

  • a/bw distance is 4.99 MU
  • bw/cv distance is 26.99 MU
  • a/cv distance is 23.98.
  • a/vg distance is 31.5 MU
  • bw/vg distance is 33.9 MU
  • cv/vg distance is 12.62 MU

Gene e assorts independently. Its location is symbolical, meaning that it might be in the same chromosome but far away from the rest of the genes,  or it might be located in another chromosome.

Explanation:  

Due to technical problems, you will find the complete answer in the attached file

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