CELL DIVISION
MEIOSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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nuclear membrane breaks down
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DNA organizes into chromosomes
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crossing-over
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chromosomes align along the central plate of the cell
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none of the above
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Detailed explanation-1: -Hence answer is ‘Homologous chromosomes cross over’
Detailed explanation-2: -Pairing of homologous chromosomes allowing independent segregation and crossing over is unique to meiosis. In mitosis, homologous chromosomes behave independently.
Detailed explanation-3: -Crossing over occurs in meiosis but not mitosis because meiosis creates genetically unique cells and mitosis creates genetically identical cells. During meiosis in prophase I, crossing over occurs where homologous chromosomes exchange corresponding sections of DNA.
Detailed explanation-4: -Crossing over is a cellular process that happens during meiosis when chromosomes of the same type are lined up. When two chromosomes-one from the mother and one from the father-line up, parts of the chromosome can be switched. The two chromosomes contain the same genes, but may have different forms of the genes.