LABORATORY REVIEW
MITOSIS AND MEIOSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It allows for fewer mutations in offspring.
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It allows for adjustments in a population’s sex ratio.
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It increases genetic variation in offspring.
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It increases the number of chromosomes in offspring
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Detailed explanation-1: -During prophase II, sister chromatids separate from each other, and as they travel to opposite ends of the cell, DNA segments of nearby chromosomes are exchanged. Which of the following correctly explains how crossing over benefits organisms that reproduce sexually? It allows for fewer mutations in offspring.
Detailed explanation-2: -The crossing over or recombination of genes which occurs in meiosis rearranges the alleles present in each chromosome of a homologous pair, allowing the mixing of paternal and maternal genes, either of which can be expressed in the resultant offspring.
Detailed explanation-3: -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-4: -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.