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These are the results of a three point cross in Drosophila for the three loci DEF:...

These are the results of a three point cross in Drosophila for the three loci DEF: deF =89, dEf =33, DEF =166, dEF =276, def =187, DeF =42, DEf =98, Def =287. The map distance between the E and F loci is 22.24cM. The map distance between the D and F loci is 36.33cM. Calculate the Interference correct to 2 decimal placess

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Expert Solution

Interference = 0.235

  • The most frequently occurring genotypes are the parental genotypes and the lowest occurring frequency is of double crossovers.
  • Ratio of observed to expected number of cross overs is known as cofficient of coincidence.
  • Chiasma formation in one chromosome decreases the probability of formation of another chiasma in the adjacent chromosomal region this effect is known as interference also known as chiasma interference.
  • Interference results in occurrence of of very less number of double crossover types than expected if there would have been no interference.

gladiator answered 2 years ago
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