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Crossing over takes place between :-
[West Bengal 2007]
  • a)
    2 sister chromatids
  • b)
    2 non-sister chromatids
  • c)
    3 homologous chromosomes
  • d)
    4 non-homologous chromosomes
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Crossing over takes place between :-[West Bengal 2007]a)2 sister chrom...
Non-sister chromatids are chromatids of homologous chromosomes.
During cell division each chromosome needs to replicate, this ensures that the each daughter cell gets a complete set of chromosomes, which produces sister chromatids. These chromatids contain the exact same genes and the exact same alleles - the chromatids are exact copies of each other. Every chromosome has a homologous pair, one from the mother (maternal) and one from the father (paternal), these homologous pairs contain the same genes but may contain different alleles, there are not exact copies of each other and are called non-sister chromatids.
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Most Upvoted Answer
Crossing over takes place between :-[West Bengal 2007]a)2 sister chrom...
Crossing over
 is the exchange of genetic material between 2 homologous chromosomes non sister chromatids
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Community Answer
Crossing over takes place between :-[West Bengal 2007]a)2 sister chrom...
Non sister chromatid may be of homologous or non homologous chromosome, but homologous chromosome have always non sister chromatid. so more probably answer should become C
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Crossing over takes place between :-[West Bengal 2007]a)2 sister chromatidsb)2 non-sister chromatidsc)3 homologous chromosomesd)4 non-homologous chromosomesCorrect answer is option 'B'. Can you explain this answer?
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