CELL DIVISION
MEIOSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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crossing over mixes up genes
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crossing over results in homologous chromosomes switching cells
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genes mixed by crossing over will result in genetically different haploid cells
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genetic variety comes from independent assortment
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Detailed explanation-1: -Explanation: Crossing over is a process that happens between homologous chromosomes in order to increase genetic diversity. During crossing over, part of one chromosome is exchanged with another. The result is a hybrid chromosome with a unique pattern of genetic material.
Detailed explanation-2: -Crossing over is important for the normal segregation of chromosomes during meiosis. Crossing over also accounts for genetic variation, because due to the swapping of genetic material during crossing over, the chromatids held together by the centromere are no longer identical.
Detailed explanation-3: -Answer and Explanation: 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 ensures the variation of offsprings and generates a genetic difference within the population. Recombination changes the genetic pool of organisms by changing the gene frequency which is an important step of evolution. New combinations of traits and new phenotypes are resulted through recombination.