In performing the following dihybrid testcross, I obtain the following F2 phenotypes. What is the distance...
Homework Answers
- Recombination frequency (RF) indicates the frequency of chromosomal crossover between two genes.
- RF measures genetic linkage and the loci of gene on a chromosome.
- Recombination frequency (measured in %) determines the distance of two gene loci (measured in centi-Morgan (cM) or as map unit (MU).
- During recombination process (like meiotic recombination, where recombination occurs between non-sister chromatids), the further the genes are the more is their tendency to cross over or higher is the recombination frequency (as indicated by Morgan).
RF= Number of recombinants/ (Number of recombinants + Number of non-recombinants) x 100
In given case:
Recombinants = 42 + 38 = 80
Total = 450+470+42+38 =1000
RF = 80 /1000 x 100 = 8 = map distance = 8 cM
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