CELL DIVISION
MEIOSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It occurs during mitosis and reduces the chances of genetic variation in organisms.
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It occurs during mitosis and increases the chances of genetic variation in organisms.
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It occurs during meiosis and reduces the chances of genetic variation in organisms.
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It occurs during meiosis and increases the chances of genetic variation in organisms.
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Detailed explanation-1: -So, the correct answer is ‘Crossing over produces new combinations of genes on alleles, increasing genetic variation.
Detailed explanation-2: -During meiosis, homologous chromosomes (1 from each parent) pair along their lengths. The chromosomes cross over at points called chiasma. At each chiasma, the chromosomes break and rejoin, trading some of their genes. This recombination results in genetic variation.
Detailed explanation-3: -Correct answer: 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-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.
Detailed explanation-5: -The correct answer to the above question is: B. Chromatids of homologous chromosomes exchange corresponding segments.