Which of the following features of meiosis plays a direct role in generating gen
ID: 206311 • Letter: W
Question
Which of the following features of meiosis plays a direct role in generating genetically diverse gametes (select all that apply)?
Condensation of chromosomes during Prophase I and Prophase II
Formation and resolution of chiasma
Random alignment of non-homologous chromosomes on the metaphase plate during meiosis I
Interactions between non-kinetochore microtubules
Condensation of chromosomes during Prophase I and Prophase II
Formation and resolution of chiasma
Random alignment of non-homologous chromosomes on the metaphase plate during meiosis I
Interactions between non-kinetochore microtubules
Explanation / Answer
Options 2 and 3 are correct answers.
Chiasmata (singular : chiasma) are the points where crossing-over takes place where genetic material between the homologous chromosomes is exchanged. This means not the whole parental chromosome goes to one cell, but rather a mixture of both the paternal and the maternal in this one chromosome go to one cell, and an opposite mixture goes to the other, introducing variation in the gametes. Also, in Metaphase I, independent assortment of chromosomes takes place where the chromosomes from both parents align on the equator of the cell in an independent way, meaning some from each parent on one side, and the opposite on the other. This means the gamete formed has a mixture of chromosomes from the parent's parents, this is another source of genetically diverse gametes.
Chromosome condensation does not play a direct role in generating genetically diverse gametes as it serves to only organise homologous chromosomes in form of bivalents or tetrads and prepare them for further stages.
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