CELL DIVISION
MEIOSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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sister chromatids of the same chromosome.
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sister chromatids of homologous chromosomes.
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sister chromatids of non-homologous chromosomes.
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non-sister chromatids of homologous chromosomes.
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non-sister chromatids of non-homologous chromosomes.
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Detailed explanation-1: -In meiosis I, during pachytene, crossing over occurs between the non-sister chromatids of the homologous chromosomes. The exchange of genetic material (DNA) between the non-sister chromatids of the homologous chromosomes is known as crossing over.
Detailed explanation-2: -Exchange of segments between non sister chromatids of homologous chromosomes is called crossing over. It occurs during pachytene stage of prophase I in meiosis.
Detailed explanation-3: -Definition. Crossing over, as related to genetics and genomics, refers to the exchange of DNA between paired homologous chromosomes (one from each parent) that occurs during the development of egg and sperm cells (meiosis).
Detailed explanation-4: -Crossing over occurs between prophase I and metaphase I and is the process where two homologous non-sister chromatids pair up with each other and exchange different segments of genetic material to form two recombinant chromosome sister chromatids.
Detailed explanation-5: -Non – sister chromatids are a pair of homologous chromosomes having different alleles. When crossing over occurs chiasma is formed which is the point of contact between the non-sister chromatids which results in the exchange of genetic material.