A series of two-point crosses were carried out among seven loci (a, b, c, d, e,
ID: 54571 • Letter: A
Question
A series of two-point crosses were carried out among seven loci (a, b, c, d, e, f, and g), producing the following percent recombination. Using the recombination percentages, map the seven loci, indicating different chromosomes and the distances between the loci of each chromosome. Show your work. 2 pts
Loci
Recombination %
Loci
Recombination %
A,B
10
C,D
50
A,C
50
C,E
8
A,D
14
C,F
50
A,E
50
C,G
12
A,F
50
D,E
50
A,G
50
D,F
50
B,C
50
D,G
50
B,D
4
E,F
50
B,E
50
E,G
18
B,F
50
F,G
50
B,G
50
Loci
Recombination %
Loci
Recombination %
A,B
10
C,D
50
A,C
50
C,E
8
A,D
14
C,F
50
A,E
50
C,G
12
A,F
50
D,E
50
A,G
50
D,F
50
B,C
50
D,G
50
B,D
4
E,F
50
B,E
50
E,G
18
B,F
50
F,G
50
B,G
50
Explanation / Answer
Based on the given data,
The Loci which have recombination frequency 50% will assort independently and loci with less than 50% recombination frequency are linked. So, the mostly tightly linked genes in the data are B and D, Gene A has less than 50% recombination with D and B.
Therefore, the linkage group-I contains A, B and D and the B is located between A and D. (A-B-D) Likewise, the second linkage group contains C, E and G and the C located between the E and G. (E-C-G). Gene F is unlinked to either of these groups, on a third linkage group.
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