Knowing the order or the genes in the chromosome and the recombination frequencies in region 1 and 2, we can assume that there are 30% the probability of recombination between genes X and Z.
When talking about recombination frequencies, we are refering to the probabilities of recombination or crossing over between two genes.
When these genes are too close in the same chromosome, we say they are linked, and the recombination frequency might be too small.
Crossing-over between linked genes that are very close to each other in the chromosome is not that common.
A short distance between genes is a very little target for crossing-over to occur, which means that only a few of them will happen, compared with the number of events between genes that are more separated between each other.
Available data
Here we have the recombination frequency in region 1 (X-Y) and the recombination frequency in region 2 (Y-Z).
To get the value of the recombination frequency between the two extremes, we just need to add the two regions values.
R1 + R2 = Rt
25% + 5% = 30%
X----------R1----------------Y-----R2----- Z
X----------25%-------------Y------5%----Z
X-----------------------30%-----------------Z
You can learn more about recombination frequencies at
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