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During meiosis, crossover occurs between
- a)Non-sister chromatids of non-homologous chromosomes
- b)Sister chromatids of homologous chromosomes
- c)Sister chromatids of non-homologous chromosomes
- d)Non-sister chromatids of homologous chromosomes
Correct answer is option 'D'. Can you explain this answer?
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During meiosis, crossover occurs betweena)Non-sister chromatids of non...
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During meiosis, crossover occurs betweena)Non-sister chromatids of non...
Explanation:
During meiosis, crossover or recombination occurs between non-sister chromatids of homologous chromosomes.
Homologous Chromosomes:
Homologous chromosomes are pairs of chromosomes that carry the same genes, but not necessarily the same alleles. One chromosome in each pair is inherited from the mother, and the other is inherited from the father.
Crossover or Recombination:
Crossover or recombination is the exchange of genetic material between non-sister chromatids of homologous chromosomes. It occurs during the prophase I stage of meiosis.
Prophase I of Meiosis:
During the prophase I stage of meiosis, homologous chromosomes come together and pair up. This process is called synapsis. The paired homologous chromosomes form a structure called a tetrad or bivalent.
Formation of Chiasmata:
Within the tetrad, the non-sister chromatids of homologous chromosomes may exchange genetic material through a process called crossing over. The exchange occurs at specific points called chiasmata.
Importance of Crossover:
Crossover plays a crucial role in increasing genetic variation. It shuffles the genetic material between homologous chromosomes, resulting in new combinations of alleles. This genetic variation is important for the evolution and adaptation of species.
Conclusion:
During meiosis, crossover occurs between non-sister chromatids of homologous chromosomes. This process promotes genetic variation and is essential for the proper segregation of chromosomes during meiosis.
During meiosis, crossover or recombination occurs between non-sister chromatids of homologous chromosomes.
Homologous Chromosomes:
Homologous chromosomes are pairs of chromosomes that carry the same genes, but not necessarily the same alleles. One chromosome in each pair is inherited from the mother, and the other is inherited from the father.
Crossover or Recombination:
Crossover or recombination is the exchange of genetic material between non-sister chromatids of homologous chromosomes. It occurs during the prophase I stage of meiosis.
Prophase I of Meiosis:
During the prophase I stage of meiosis, homologous chromosomes come together and pair up. This process is called synapsis. The paired homologous chromosomes form a structure called a tetrad or bivalent.
Formation of Chiasmata:
Within the tetrad, the non-sister chromatids of homologous chromosomes may exchange genetic material through a process called crossing over. The exchange occurs at specific points called chiasmata.
Importance of Crossover:
Crossover plays a crucial role in increasing genetic variation. It shuffles the genetic material between homologous chromosomes, resulting in new combinations of alleles. This genetic variation is important for the evolution and adaptation of species.
Conclusion:
During meiosis, crossover occurs between non-sister chromatids of homologous chromosomes. This process promotes genetic variation and is essential for the proper segregation of chromosomes during meiosis.
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During meiosis, crossover occurs betweena)Non-sister chromatids of non-homologous chromosomesb)Sister chromatids of homologous chromosomesc)Sister chromatids of non-homologous chromosomesd)Non-sister chromatids of homologous chromosomesCorrect answer is option 'D'. Can you explain this answer?
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