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(A) The frequency of recombination is directly proportional to the distance between two genes on a chromosome. $A$ recombination frequency of $1\%$ co

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$b, a, c$

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(A) The frequency of recombination is directly proportional to the distance between two genes on a chromosome. $A$ recombination frequency of $1\%$ corresponds to $1$ map unit or $1\; cM$ (centiMorgan).Given distances:Distance between $a$ and $b = 20\; cM$Distance between $b$ and $c = 28\; cM$Distance between $a$ and $c = 8\; cM$Since the distance between $b$ and $c$ $(28\; cM)$ is the sum of the distances between $b$ and $a$ $(20\; cM)$ and $a$ and $c$ $(8\; cM)$,it implies that gene $a$ is located between genes $b$ and $c$.Therefore,the linear sequence of genes on the chromosome is $b - a - c$.

There are three genes $a, b, c$ with percentage of crossing over between $a$ and $b$ is $20\%$,$b$ and $c$ is $28\%$,and $a$ and $c$ is $8\%$. What is the sequence of genes on the chromosome?

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