Genes A , B , and C are linked on a chromosome and found in the order A-B-C. Gen
ID: 278189 • Letter: G
Question
Genes A, B, and C are linked on a chromosome and found in the order A-B-C. Genes A and B recombine with a frequency of 9%, and genes B and C recombine at a frequency of 22%. For the cross
a +b +c/abc+ × abc/abc,
predict the frequency of progeny. Assume interference is zero.
a)Predict the frequency of a+b+c progeny.
Enter your answer to four decimal places (example 0.2356 or 0.2300).
B) Predict the frequency of abc+progeny.
Enter your answer to four decimal places (example 0.2356 or 0.2300)
Part C
Predict the frequency of a+bc+progeny.
Enter your answer to four decimal places (example 0.2356 or 0.2300)
Part D
Predict the frequency of ab+c progeny.
Enter your answer to four decimal places (example 0.2356 or 0.2300)
Part E
Predict the frequency of a+b+c+ progeny.
Enter your answer to four decimal places (example 0.2356 or 0.2300)
Part F
Predict the frequency of abc progeny.
Enter your answer to four decimal places (example 0.2356 or 0.2300)
Part G
Predict the frequency of a+bc progeny.
Enter your answer to four decimal places (example 0.2356 or 0.2300)
Predict the frequency of ab+c+progeny.Part H
Enter your answer to four decimal places (example 0.2356 or 0.2300)
Explanation / Answer
Answer:
A). The frequency of a+b+c progeny= 0.3549
B)Tthe frequency of abc+progeny = 0.3549
C) The frequency of a+bc+progeny = 0.0351
D) The frequency of ab+c progeny = 0.0351
E) The frequency of a+b+c+ progeny = 0.1001
F) The frequency of abc progeny = 0.1001
G) The frequency of a+bc progeny = 0.0099
H). The frequency of ab+c+progeny = 0.0099
Explanation:
Class of gametes
Phenotype
Frequency of reciprocal pair
Numbers
Frequency of each class
Parental
a+ b+ c
1- all recombinant progeny
1-(0.0702+0.2002+0.0198) = 0.7098
0.3549
a b c+
0.3549
SCO 1
a+ b c+
RF in region 1 = SCO1 - DCO
SCO1 = 0.09 – 0.0198 = 0.0702
0.0351
a b+ c
0.0351
SCO 2
a+ b+ c+
RF in region 2 = SCO2 - DCO
SCO2 = 0.22 – 0.0198 = 0.2002
0.1001
a b c
0.1001
DCO
a+ b c
(RF in region 1) * (RF in region 2)
0.09 * 0.22 = 0.0198
0.0099
a b+ c+
0.0099
Class of gametes
Phenotype
Frequency of reciprocal pair
Numbers
Frequency of each class
Parental
a+ b+ c
1- all recombinant progeny
1-(0.0702+0.2002+0.0198) = 0.7098
0.3549
a b c+
0.3549
SCO 1
a+ b c+
RF in region 1 = SCO1 - DCO
SCO1 = 0.09 – 0.0198 = 0.0702
0.0351
a b+ c
0.0351
SCO 2
a+ b+ c+
RF in region 2 = SCO2 - DCO
SCO2 = 0.22 – 0.0198 = 0.2002
0.1001
a b c
0.1001
DCO
a+ b c
(RF in region 1) * (RF in region 2)
0.09 * 0.22 = 0.0198
0.0099
a b+ c+
0.0099
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