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Safari File Edit View History Bookmarks Window Helo steringgenetics.com 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 10%, and genes B and C recombine at a frequency of 25%. For the cross PartA Predict the frequency of a b'c progeny Enter your answer to four decimal places (example 0.2356 or 0.2300). a b clabc x abc/abc, predict the frequency of progeny. Assume interference is zero. Submit Previous Answers Request Answer X Incorrect; Try Again; 3 attempts remaining Part B Predict the frequency of abc progeny Enter your answer to four decimal places (example 0.2356 or 0.2300) Submit Request AnswerExplanation / Answer
Answer:
Part A: a+ b+ c = 0.3375
Part B: a b c+ = 0.3375
Part C: a+ b c+ = 0.0375
Part D: a b+ c = 0.0375
Explanation:
Class of gametes
Phenotype
Frequency of reciprocal pair
Numbers
Frequency of each class
Parental
a+ b+ c
1- all recombinant progeny
1-(0.075+0.225+0.025) = 0.675
0.3375
a b c+
0.3375
SCO 1
a+ b c+
RF in region 1 = SCO1 - DCO
SCO1 = 0.1 – 0.025 = 0.075
0.0375
a b+ c
0.0375
SCO 2
a+ b+ c+
RF in region 2 = SCO2 - DCO
SCO2 = 0.25 – 0.025 = 0.225
0.1125
a b c
0.1125
DCO
a+ b c
(RF in region 1) * (RF in region 2)
0.1 * 0.25 = 0.025
0.0125
a b+ c+
0.0125
Class of gametes
Phenotype
Frequency of reciprocal pair
Numbers
Frequency of each class
Parental
a+ b+ c
1- all recombinant progeny
1-(0.075+0.225+0.025) = 0.675
0.3375
a b c+
0.3375
SCO 1
a+ b c+
RF in region 1 = SCO1 - DCO
SCO1 = 0.1 – 0.025 = 0.075
0.0375
a b+ c
0.0375
SCO 2
a+ b+ c+
RF in region 2 = SCO2 - DCO
SCO2 = 0.25 – 0.025 = 0.225
0.1125
a b c
0.1125
DCO
a+ b c
(RF in region 1) * (RF in region 2)
0.1 * 0.25 = 0.025
0.0125
a b+ c+
0.0125
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