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Meiosis is a process where germ cells divide to produce gametes, such as sperm and egg cells. In prophase I of meiosis, chromosomes condense and homologous recombination takes place, leading to genetic variation through chromosomal crossover.
This process, in which homologous chromosomes trade parts, is called crossing over. It's helped along by a protein structure called the synaptonemal complex that holds the homologues together.
31 de ago. de 2016 · Crossing over between non sister chromatids of homologous chromosomes occur leading to formation of X shaped chiasmata. Nucleolus and nuclear membrane are present. (not visible) Diplotene. The chromosomes are thick and darkly stained. The chromosomes are wooly in appearance. The paired chromosomes separate from each other except for the chiasmata.
1 de feb. de 2015 · A spatial patterning phenomenon known as interference ensures that crossovers are well-spaced along the chromosomes. Additionally, every pair of homologs acquires at least one crossover.
Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells.
The synaptonemal complex supports the exchange of chromosomal segments between homologous nonsister chromatids—a process called crossing over. Crossing over can be observed visually after the exchange as chiasmata (singular = chiasma) (Figure 11.3).
In these regions exchange of DNA between homologe chromosomes (C) can occur: crossing-over). Crossing-over (or crossover) requires that the chromosomes break and reconnect to the other chromosome. Metaphase I ( D ).
