What occurs when two genes are located extremely close to each other on the same chromosome?

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The likelihood of crossing over between them is quite high.Crossing over events between them are rarely observed.Crossing over never happens between these two genes.Only double crossover events can occur between them.They always assort independently during meiosis.

Explanation

When two genes are positioned very close to each other on a chromosome, the chance of recombination or crossing over between them is effectively zero, meaning no crossing over takes place.