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Crossing over is a significant process in meiosis that contributes to genetic variability by producing new combinations of genes in gametes. This process occurs during prophase I of meiosis when homologous chromosomes exchange genetic material.
Here's how crossing over contributes to the role of meiosis:
1. It increases genetic variability by creating new combinations of genes: During crossing over, segments of DNA are exchanged between homologous chromosomes. This results in genetic recombination, leading to offspring with unique genetic traits.
2. It does not copy genes in DNA before gametes are formed: Crossing over does not involve copying genes but rather shuffling genetic material between chromosomes.
3. It does not form a unique number of chromosomes in daughter cells: The number of chromosomes remains the same in daughter cells after meiosis, with half the number of chromosomes compared to the parent cell.
4. It does not result in new diploid daughter cells: Meiosis produces haploid daughter cells with half the number of chromosomes as the parent cell.
In summary, crossing over plays a crucial role in increasing genetic diversity among offspring by generating novel combinations of genes in gametes during meiosis.
