3. A series of two-point crosses were carried out among seven loci (a, b, c, d,
ID: 53984 • 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
4. In ants, long antennae is dominant over short antennae. Coarse antennae is dominant over fuzzy antennae. A heterozygous ant is mated in a testcross and the following progeny are produced:
long, coarse antennae474
long, fuzzy antennae 20
short, coarse antennae16
short, fuzzy antennae490
a. Assuming the two loci are linked, the calculated map distance between them in map units is:
1 pt
b. In the above testcross, in which linked arrangement is the heterozygous individual? 1 pt
a. cisb. transc. cannot be determined
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
4)
The genotypes of antennae are as follows:
The genotype of heterozygous ant is: LlCc
The genotype of test cross parent: llcc
Thus, the cross is: LlCc × llcc
So,
Thus, the recombination frequency is 3.67m.u
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.