science
Grade-10
Easy
Question
Meiosis I is reductional division, and meiosis II is equational division because of
Separation of chromatids
The disjunction of homologous chromosomes
Crossing over
The pairing of homologous chromosomes
Separation of chromatids
The disjunction of homologous chromosomes
Crossing over
The pairing of homologous chromosomes
Hint:
Meiosis I and II are named based on the ploidy number of cells in meiosis and the ploidy number of cells before those stages begin. Meiosis I leads to the formation of haploid cells.
The correct answer is: Separation of chromatids
- The first meiosis forms two cells with 46 chromosomes each. The second round of meiosis then occurs, and these two cells each continue to divide, resulting in them becoming four haploid cells.
- Therefore, meiosis is called reductive division because at the end of this particular type of cell division four haploid cells are formed.
- On the other hand, in meiosis II, the two chromatids of each chromosome separate from each other and move to separate daughter cells. As a result, the number of chromosomes remains the same as in meiosis I, with no gain or loss. Therefore, meiosis II is known as equivalence or homotypic division.
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