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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Detailed explanation-1: -Hence answer is ‘Homologous chromosomes cross over’
Detailed explanation-2: -During meiosis, there is an important step to genetic variation. This step is called crossing over, or a crossover, and is unique to gametes. Crossing over occurs when chromosomes “trade” sections of their DNA, shuffling genes between them.
Detailed explanation-3: -Pairing of homologous chromosomes allowing independent segregation and crossing over is unique to meiosis. In mitosis, homologous chromosomes behave independently.
Detailed explanation-4: -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.