CELL DIVISION
MEIOSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They result from the replication of DNA before meiosis.
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They are only present in meiosis I.
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They split apart during metaphase I in meiosis.
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They are only present in meiosis II.
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Detailed explanation-1: -Which is a characteristic of the pairs of sister chromatids that are visible during meiosis? They result from the replication of DNA before meiosis.
Detailed explanation-2: -The sister chromatids are pairs of identical copies of DNA joined at a point called the centromere. During anaphase, each pair of chromosomes is separated into two identical, independent chromosomes. The chromosomes are separated by a structure called the mitotic spindle.
Detailed explanation-3: -Meiosis is characterized by one round of DNA replication followed by two rounds of cell division, resulting in haploid germ cells. Crossing-over of DNA results in genetic exchange of genes between maternal and paternal DNA.
Detailed explanation-4: -The sister chromatids are identical to one another and are attached to each other by proteins called cohesins. The attachment between sister chromatids is tightest at the centromere, a region of DNA that is important for their separation during later stages of cell division.
Detailed explanation-5: -In meiosis II, the sister chromatids separate, making haploid cells with non-duplicated chromosomes.