While doing some biology I came across this question:
The following tables present results of plant crosses involving two linked genes: S is a seed-color gene, and L is a plant-height gene. Each gene has two alleles with one allele exhibiting complete dominance over the other allele. Dominant phenotypes are yellow seeds, and tall plants; recessive phenotypes are green, and short, respectively. Assume that crossing-over between two genes occurs once.
Calculate the map unit between gene L and gene S. (One map unit = distance of 1% recombination)
This question confuses me because what I understand from the table is that from crossing over we get short flowers with green seeds(0.01) and tall ones with yellow seeds(that 0.01 from 0.51). So as a result from the fertilization we get a 0.02 frequency, that as I understand also equals the recombination rate. And so the map unit would need to be 0.02*100= 2%. But the response I have to get is 20%, which I do no understand how to get to.