There are three genes $a, b, c$. The percentage of crossing over between $a$ and $b$ is $20\%$,between $b$ and $c$ is $28\%$,and between $a$ and $c$ is $8\%$. What is the sequence of genes on the chromosome?
- A$b, a, c$
- B$a, b, c$
- C$a, c, b$
- DNone of these
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