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Question

What stage does crossing over occur in meiosis?


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Solution

Crossing over:

  1. Crossing over refers to the exchange of genetic material or chromosome segments between non-sister chromatids in meiosis.
  2. This genetic process occurs between homologous regions of matching chromosomes and the interchange of homologous chromosomes.
  3. Crossing over is an enzyme-mediated process, where the exchange of genetic material between non-sister chromatids of homologous chromosomes takes place.
  4. It occurs at the pachytene stage of prophase I of meiosis.

Significance of crossing over:

  1. Crossing over produces a new combination of genes.
  2. Crossing over plays an essential role in the process of evolution.
  3. Crossing over frequency helps in the construction of genetic maps.
  4. Crossing over provides evidence for a linear arrangement of linked genes in a chromosome.
  5. Crossing over provides an inexhaustible store of gene variability in sexually reproducing organisms.
Statement I: Synapsis is the process of pairing of homologous chromosomes.  Statement II: Crossing over occurs between sister chromatids of homologous  chromosomes. Which of the above statements are correct?

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