In a cell undergoing meiosis, which sequence of events is shown in correct order?
A. the cytoplasm divides, chromosomes line up at the equator, nuclear envelope forms.
B. chromosomes become visible, chromosomes line up at the equator, chromosomes gather at the poles of the cell.
C. homologous chromosomes move to equator, chromatids move to opposite poles of the cell, spindle forms around chromosomes.
D. both b and c.
I know that the correct answer is not A, but that's all I know.
The correct answer is D. Both B and C are correct sequences of events in a cell undergoing meiosis.
The correct answer is D, "both b and c".
During meiosis, the process of cell division occurs in two stages: Meiosis I and Meiosis II.
In Meiosis I, the events occur in the following order:
1. Chromosomes become visible: In this stage, the chromatin condenses and coils, forming distinct chromosomes.
2. Chromosomes line up at the equator: The homologous chromosomes align themselves along the equatorial plane of the cell, forming pairs.
3. Chromosomes gather at the poles of the cell: The homologous chromosomes separate and migrate to opposite ends (poles) of the cell.
In Meiosis II, the events occur in the following order:
1. Chromatids move to opposite poles of the cell: The sister chromatids of each chromosome separate and move towards opposite poles of the cell.
2. Spindle forms around chromosomes: A spindle apparatus consisting of microtubules forms and attaches to the centromeres of the chromosomes.
Therefore, the correct sequence of events in a cell undergoing meiosis is "chromosomes become visible, chromosomes line up at the equator, chromosomes gather at the poles of the cell, chromatids move to opposite poles of the cell, spindle forms around chromosomes", which corresponds to option D.
To determine the correct answer, we need to understand the process of meiosis. Meiosis is a type of cell division that produces gametes (sex cells) with half the number of chromosomes as the parent cell. It consists of two divisions: meiosis I and meiosis II.
Let's evaluate each option to identify the correct sequence of events:
A. the cytoplasm divides, chromosomes line up at the equator, nuclear envelope forms.
This option doesn't match the sequence of events during meiosis. In meiosis, chromosomes line up at the equator before the cytoplasm divides, and the nuclear envelope disassembles, rather than forms.
B. chromosomes become visible, chromosomes line up at the equator, chromosomes gather at the poles of the cell.
This option correctly identifies the visualization of chromosomes at the beginning of meiosis. However, the second part is incorrect. During meiosis I, chromosomes gather at the poles of the cell, but this happens after they separate into homologous pairs rather than while they are lined up at the equator.
C. homologous chromosomes move to equator, chromatids move to opposite poles of the cell, spindle forms around chromosomes.
This option seems to be the most accurate representation of the sequence of events in meiosis. In meiosis I, homologous chromosomes align at the equator, followed by the separation of chromatids, which move to opposite poles of the cell. Additionally, the formation of the spindle is also a crucial step in meiosis.
D. both b and c.
Option D combines parts of options B and C. However, option B is not entirely accurate, while option C represents the correct sequence of events in meiosis. Therefore, option D is incorrect.
Based on the analysis, the correct sequence of events in meiosis is represented by option C:
C. homologous chromosomes move to equator, chromatids move to opposite poles of the cell, spindle forms around chromosomes.
Therefore, the correct answer is C.