Question
In: Biology
In a three-point testcross, it was found that the genetic map for three linked genes was:...
- In a three-point testcross, it was found that the genetic map for three linked genes was: A-----30 m.u.------B------20 m.u----C.
A genetic cross was performed and it the outcome was, that of 1000 progeny, 1 double recombinant was observed. How does this compare to what we would have expected? Interpret and explain this genetic phenomenon? (5 marks)?
Solutions
Expert Solution
Answer:
- Map distance represents the Frequency of recombination. 1 map unit is equal to 1% recombination Frequency.
- The recombination Frequency between gene A and B is 30% , between B and C is 20%.
- Recombinant between A and B = 1000 × 30% = 300
- Recombinant between B and C = 1000 × 20% = 200
- So the expected rate of double recombinant = (300/1000) × (200/1000) = 0.06 or 60 per 1000.
- Observed double recombinant = 1
- Coefficient of coincidence = 1÷60= 0.016
- So, interference = 1 - 0.016 = .984
- Interference interpret that crossover in one region of the chromosomes affect the occurrence of crossover at another region.
- If the value of interference is "0" then no interference is occurring. If the value is 1 that means complete interference. If the value is in between 0 to 1 that means interference is occurring but not complete.
So,
here interference is occurring.
Please Rate My Answer...........Thank...........u...
gladiator answered 2 years agoRelated Solutions
In a three-point testcross, it was found that the genetic map, for three, linked genes was:...
In a three-point testcross, it was found that the genetic map,
for three, linked genes was: A-30 mu-B-20mu-C A genetic cross was
performed and, the outcome was; that of 1000 progeny 1 double
recombinant was observed. How does this compare to what we have
expected? Explain this phenomenon.
In a three-point testcross, it was found that the genetic map for three linked genes was:...
In a three-point testcross, it was found that the genetic map
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A genetic cross was performed and it the outcome was, that of 1000
progeny, 1 double recombinant was observed. How
does this compare to what we would have expected? Interpret and
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