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I am curious to know if it is completely impossible calculate recombinant frequency for monohybrids ( three point link, gene map etc.)

Here is an example:

Marker 1

  1. xx= 25
  2. xy=100
  3. yy= 20

Marker 2

  1. xx=30
  2. yx= 89
  3. yy= 20

Marker 3

  1. xx= 100
  2. yx=50
  3. yy= 100

This is what I think it would be like for x:x Marker 1 to 3

grand total = 534

So from Marker 1 to Marker 2 it would be 25+30/534 = 0.1029

Marker 2 to Marker 3 : 30 +100/534= 0.2429

Marker 1 to Marker 3: 125/534= 0.2340

Am I on the right track --- if not can you please show how it would be done for this example?

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  • $\begingroup$ Can you please clarify what xx, xy and yy are as well as the genotypes of the parents? What are the two loci and the alleles at each locus? $\endgroup$ – Remi.b Oct 24 '18 at 23:31
  • $\begingroup$ xx and yy are the parents (genotype), the alleles are either x or y $\endgroup$ – wardah m Oct 25 '18 at 3:30
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    $\begingroup$ How about the other locus, then? You can only talk about recombinants if you consider at least 2 loci. $\endgroup$ – Remi.b Oct 25 '18 at 4:56
  • $\begingroup$ This information is from a sample SNP call data indicating the to total calls for those genotypes. That's all the information I have is there no way to calculate RF ? $\endgroup$ – wardah m Oct 25 '18 at 13:59
  • $\begingroup$ No, you can't calculate a recombination rate between two loci with only information about a single locus. If your question is a homework question, please use the homework tag $\endgroup$ – Remi.b Oct 25 '18 at 17:00

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