The degree (frequency) of crossing over between two genes is directly proportional to the distance between them on a chromosome.

Quick Scoop

  • When two genes are far apart , there is a higher chance that a crossover will occur between them during meiosis, so the degree of crossing over (recombination frequency) is high.
  • When two genes are very close together , a crossover is less likely to fall between them, so the degree of crossing over is low.
  • In classical gene mapping, this relationship is treated as roughly linear:
    • Higher recombination frequency ⇒ genes are farther apart.
    • Lower recombination frequency ⇒ genes are closer together.

In simple MCQ form, the correct statement is:

It is direct : as the distance between two genes increases , the frequency (degree) of crossing over between them increases.

So, more distance → more crossing over; less distance → less crossing over.

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Learn what is the relationship between the degree of crossing over and the distance between two genes? In genetics, recombination frequency rises as genes are farther apart on a chromosome.

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