A series of two-point crosses among fruit flies is carried out between genes for
ID: 56673 • Letter: A
Question
A series of two-point crosses among fruit flies is carried out between genes for brown eyes (bw), arc wings (a), vestigial wings (vg), ebony body color (e), and curved wings (cv). The following number of nonrecombinant and recombinant progeny 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
Using these data from two-point crosses, what it the best genetic map (in cM) that can be developed?
A)cv 5 bw 13 a 34 vg with e assorting independently
B)bw 5 cv 24 vg 32 a with e assorting independently
C)a 5 bw 13 vg 24 e with vg assorting independently
D)cv 13 bw 5 a 27 vg with e assorting independently
E)bw 5 a 24 cv 13 vg with e assorting independently
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
Explanation / Answer
E)bw 5 a 24 cv 13 vg with e assorting independently
Genes in Cross: Number of nonrecombinant progeny: Number of recombinant progeny Recombination frequency: a, bw 2224 117 117/2341 = 5% a, cv 2609 823 823/3432 = 24% a, e 3200 3200 3200/6400 = 50% a, vg 5172 2433 2433/7605 = 32% bw, cv 4614 1706 1706/6320 = 27% bw, e 4150 4150 4150/8300 = 50% bw, vg 2796 1440 1440/4236 = 34% cv, e 3116 3117 3117/6233 = 50% cv, vg 2102 208 208/2310 = 9%Related Questions
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