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What Is The Event That Happens When Homologous Chromosomes Line Up And Exchange Genetic Information? (Solved)

Prophase I sees cross-over. It is the transfer of genetic material between sister chromatids with homologous genomes. Remember that homologous DNA chromosomes are laid out in pairs along their lengths. This creates a structure known as a Tetrad, which is four chromatids. At this point, the chromatids are very close to each other and some material from two chromatids switch chromosomes, that is, the material breaks off and reattaches at the same position on the homologous chromosome (Figure (PageIndex)) 🔥 This exchange of genetic material can happen many times within the same pair of homologous chromosomes, creating unique combinations of genes 😎 This process is also known as recombination 🙈 [1]
Recombination happens during meiosis. The cell’s homologous DNA chromosomes are very close together. Next, each DNA strand in each chromosome is broken at exactly the same spot, leaving only two ends. The ends cross over to the opposite chromosome, forming a link called a “chiasma”. This process is where large parts of DNA that contain many genes can cross over from one chromosome. The crossing-over phase is over as prophase 1 draws to an end and metaphase II begins. At this point, homologous DNA chromosomes are ready to seperate. Each chromosome is enriched with unique combinations of alleles that result from recombination when the homologous cells are pulled apart in anaphase 1. Blima Crowell revised the text on December 3, 2021. [2]
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Meiosis can be described as a type of eukaryotic cell-division, similar to mitosis. But these processes do not distribute genetic material between the daughter cells. Mitosis results in two identical daughters cells, each with the exact same number of DNA chromosomes. Meiosis, on the other hand, gives birth to four distinct daughter cells. Each one has twice the number of genes as their parent. Because meiosis creates cells that are destined to become gametes (or reproductive cells), this reduction in chromosome number is critical — without it, the union of two gametes during fertilization would result in offspring with twice the normal number of chromosomes! [3]
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Crossing over. Crossing Over is a process in which cells exchange information. happens during meiosis when chromosomes of the same type They are arranged in a line. When two chromosomes — one from the mother and one from the father — line up, parts of the chromosome can be switched. Both chromosomes may contain identical genes but different versions of those genes. Let’s suppose that the mother’s version of a gene could be transferred to the father’s, or vice versa. This biological activity is very important and interesting. Different combinations of genes can be passed to the offspring. This genetic variation can increase the species’ diversity. Diversity increases a species’ capacity to adapt to changes over time and evolve. We are grateful to Elya Boles, who shared this information with us. [4]
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Refer to the Article

  1. https://bio.libretexts.org/Bookshelves/Human_Biology/Book:_Human_Biology_(Wakim_and_Grewal)/07:_Cell_Reproduction/7.6:_Genetic_Variation
  2. http://www.nature.com/scitable/topicpage/dna-is-constantly-changing-through-the-process-6524876
  3. https://www.nature.com/scitable/topicpage/replication-and-distribution-of-dna-during-meiosis-6524853/
  4. https://www.genome.gov/genetics-glossary/Crossing-Over
Mehreen Alberts

Written by Mehreen Alberts

I'm a creative writer who has found the love of writing once more. I've been writing since I was five years old and it's what I want to do for the rest of my life. From topics that are close to my heart to everything else imaginable!

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