CELL DIVISION
MEIOSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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nuclei form around the chromosome pairs, and the cell divides into two daughter cells
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the centromeres of sister chromatids separate.
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genetic material is exchanged through breakage and reunion of portions of the chromosomes
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the paired chromosomes line up on the equatorial plate of the cell.
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Detailed explanation-1: -Crossing over is a process by which chromatids of homologous chromosomes exchange portions of genetic material, usually during tetrad formation of meiosis. Crossing over occurs at pachytene sub stage of prophase I of meiosis but visible at diplotene substage of prophase I.
Detailed explanation-2: -During prophase I, homologous chromosomes pair up and exchange sections of DNA. This is called recombination or crossing over. This is followed by metaphase I where the connected pairs of chromosomes align at the middle of the cell.
Detailed explanation-3: -Crossing Over 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: -During prophase I, homologous chromosomes pair and form synapses, a step unique to meiosis. The paired chromosomes are called bivalents, and the formation of chiasmata caused by genetic recombination becomes apparent. Chromosomal condensation allows these to be viewed in the microscope.