3. A series of two-point crosses were carried out among seven loci (a, b, c, d,
ID: 54200 • Letter: 3
Question
3. 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
50% recombination indicates that the genes assort independently. Less than 50% recombination indicates linkage. Starting with the most tightly linked genes b and d, we look for other genes linked to these and find only gene c has less than 50% recombination with b and d. So one linkage group consists of b, d, and c.
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