what is crossing orer
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Crossing over is a basic concept of genetics and cell biology, often called recombination. It occurs during meiosis. Crossing over is the exchange of chromosome segments between non-sister chromatids during the production of gametes. ... The large-scale effect of crossing over is to spread variation through a population.
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Explanation:
Crossing over is a major concept in genetic variation. It takes place in Meiosis-1 of 'PACHYTENE'. Crossing over is done between a non-sister chromatids with the help of recombination nodules. At the nodule non-sister chromatids overlap each other and this chromatids form 'X' shape termed as CHIASMATA. This is termed as crossing over.
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