I need help with this question please 2 From Russell Genetic

I need help with this question please!

2. [From Russell, Genetics] Bridges and Morgan mapped genes on chromosome 2 of Drosophila. They obtained the following results for the genes black body (b), curved wing (c), purple eye (pr), speck wing (sp) and vestigial wing (vg by a series of 2-point crosses in cis of the general type xy x xy (male) Genes in Cross Total Progeny Recombinants 62,679 14,237 b, c 48,931 3,026 b, pr b, sp 685 326 3,578 20,153 b, vg 51,136 10,205 c, pr 10,042 3,037 c, sp 1720 141 c, Vg 11,985 5474 pr, sp 13,601 609 pr, vg 2,054 738 Sp, Vg Using these data, draw the genetic map for these markers as best you can. Remember that determinations for short distances are more accurate than determinations for large distances.

Solution

Let us first determine the percentage of recombinants for each cross -

Let us now arrange the genes in order of the recombination percentage -

Based on the above information, the order of the genes is likely to be -

b------pr-------------vg-----c------------------------------------------------sp

Genes in cross	Total Progeny	Recombinants	Percentage of recombinants
b, c	62679	14237	22.71
b. pr	48931	3026	6.18
b, sp	685	326	47.59
b, vg	20153	358	17.75
c, pr	51136	10205	19.95
c, sp	10042	3037	30.24
c, vg	1720	141	8.19
pr, sp	11985	5474	45.67
pr, vg	13601	1609	11.83
sp, vg	2054	738	35.92