Meiotic cell division has two steps, called Meiosis I and Meiosis II.
Which of the following is correct about each step?
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a
At the end of Meiosis I one haploid cell has remained one haploid cell, and at the end of Meiosis II one haploid cell have become two diploid cells.
b
At the end of Meiosis I one diploid cell has remained one diploid cell, and at the end of Meiosis II one diploid cell has become two haploid cells.
c
At the end of Meiosis I one diploid cell has become two haploid cells, and at the end of Meiosis II two haploid cells have become four haploid cells.
d
At the end of Meiosis I one haploid cell has become two diploid cells, and at the end of Meiosis II two diploid cells have become four haploid cells.
c
At the end of Meiosis I one diploid cell has become two haploid cells, and at the end of Meiosis II two haploid cells have become four haploid cells.
The correct answer is:
c) At the end of Meiosis I one diploid cell has become two haploid cells, and at the end of Meiosis II two haploid cells have become four haploid cells.
To determine the correct answer, we need to understand the process of meiotic cell division.
Meiosis is a type of cell division that occurs in sexually reproducing organisms. It involves two rounds of division, known as Meiosis I and Meiosis II, that result in the formation of gametes (sex cells) with half the number of chromosomes as the parent cell.
During Meiosis I:
- The parent cell, which is diploid (contains two sets of chromosomes), undergoes homologous chromosome pairing and crossing over.
- The homologous chromosomes separate, resulting in two haploid cells (each with one set of chromosomes).
- The process of genetic recombination occurs during Meiosis I, leading to genetic diversity.
During Meiosis II:
- Each of the two haploid cells produced in Meiosis I now undergoes a second round of division.
- The sister chromatids of each chromosome separate, resulting in the formation of four haploid cells (each with one set of chromosomes).
- The number of chromosomes remains the same throughout Meiosis II.
Now let's analyze each option:
a) At the end of Meiosis I, one haploid cell has remained one haploid cell, and at the end of Meiosis II, one haploid cell has become two diploid cells.
This option is incorrect because Meiosis II does not result in the formation of diploid cells. It produces four haploid cells.
b) At the end of Meiosis I, one diploid cell has remained one diploid cell, and at the end of Meiosis II, one diploid cell has become two haploid cells.
This option is also incorrect because Meiosis I results in the formation of two haploid cells, not diploid cells.
c) At the end of Meiosis I, one diploid cell has become two haploid cells, and at the end of Meiosis II, two haploid cells have become four haploid cells.
This option is incorrect because Meiosis I does not result in the formation of haploid cells. It produces two haploid cells.
d) At the end of Meiosis I, one haploid cell has become two diploid cells, and at the end of Meiosis II, two diploid cells have become four haploid cells.
This option is the correct choice. Meiosis I produces two haploid cells, and then during Meiosis II, those haploid cells divide to form four haploid cells.
Therefore, the correct answer is option d:
At the end of Meiosis I, one haploid cell has become two diploid cells, and at the end of Meiosis II, two diploid cells have become four haploid cells.