Reference no: EM131470808
Problem 1
Three recessive genes on chromosome 2 of Drosophila melanogaster are: welt , cinnabar , and brown . The numbers of phenotypes from a trihybrid test cross are shown below:
|
Wild type
|
265
|
|
welt ,cinnabar ,brow n
|
239
|
|
brown
|
155
7
|
|
welt ,cinnabar
|
150
9
|
|
cinnabar
|
859
|
|
welt ,brown
|
829
|
|
welt
|
236
8
|
|
brown ,cinnabar
|
236
5
|
What is the gene order and map distance between the three genes and what is the percent interference?
Problem 2
Three recessive genes on chromosome 1 of Drosophila melanogaster are: prawny , no bridge , and cut. The numbers of phenotypes from a trihybrid test cross are shown below:
|
Wild type
|
2
|
|
prawny ,no bridge ,cut
|
10
|
|
no bridge
|
196
|
|
prawny ,cut
|
191
|
|
cut
|
109
|
|
prawny ,no bridge
|
131
|
|
prawny
|
354
4
|
|
no bridge ,cut
|
348
1
|
What is the gene order and map distance between the three genes and what is the percent interference?
Problem 3
Three recessive genes on chromosome 3 of Drosophila melanogaster are: claret , rough , and ebony. The numbers of phenotypes from a trihybrid test cross are shown below:
|
Wild type
|
90
|
|
claret ,rough ,ebon y
|
93
|
|
claret
|
824
|
|
rough ,ebony
|
774
|
|
ebony
|
390
|
|
claret ,rough
|
372
|
|
rough
|
261
9
|
|
claret ,ebony
|
259
0
|
What is the gene order and map distance between the three genes and what is the percent interference?
Problem 4 Three recessive genes on chromosome 2 of Drosophila melanogaster are: brown, welt, and cinnabar. The numbers of phenotypes from a trihybrid test cross are shown below:
|
Wild type
|
597
|
|
brown ,welt ,cinnaba r
|
629
|
|
brown
|
167
2
|
|
welt ,cinnabar
|
170
2
|
|
cinnabar
|
201
|
|
brown ,welt
|
173
|
|
welt
|
106
1
|
| brown ,cinnabar |
107
0
|
What is the gene order and map distance between the three genes and what is the percent interference?
Problem 5 Three recessive genes on chromosome 1 of Drosophila melanogaster are: wider , prawny , and no bridge . The numbers of phenotypes from a trihybrid test cross are shown below:
|
Wild type
|
332
1
|
|
wider ,prawny ,no bridge
|
336
5
|
|
no bridge
|
154
|
|
wider ,prawny
|
131
|
|
wider
|
732
|
|
prawny ,no bridge
|
763
|
|
prawny
|
29
|
|
wider ,no bridge
|
21
|
What is the gene order and map distance between the three genes and what is the percent interference?
Problem 6 Three recessive genes on chromosome 2 of Drosophila melanogaster are: dachs , aristaless , and odd skipped. The numbers of phenotypes from a trihybrid test cross are shown below:
|
Wild type
|
341
|
|
dachs ,aristaless ,odd skipped
|
288
|
|
aristaless
|
274
9
|
|
dachs ,odd skipped
|
277
9
|
|
dachs
|
66
|
|
aristaless ,odd skipped
|
70
|
|
odd skipped
|
888
|
|
dachs ,aristaless
|
950
|
What is the gene order and map distance between the three genes and what is the percent interference?
|
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