Answer:
Explanation:
Through the process of Meiosis, a diploid germ cell (2n) divides and originates four daughter cells with a haploid chromosome number (n). These are the gametes. Each daughter cell has half of the chromosomes of the original one. Meiosis is completed in two phases. During the first phase, and after replication, occurs the chromosome´s reduction division. During the second phase, the cell suffers a new, not reductive division.
1. In the first phase, Meiosis I:
Prophase I: Chromosomes condensate and became visible. Occurs crossing-over between homologous chromosomes. Crossin-over makes the daughter cells to be genetically different from the original one.
Metaphase I: The pairs of homologous chromosomes randomly align in the equatorial plane.
Anaphase I: occurs the independent separation of homologous chromosomes that migrate to opposite poles of the cell. This separation generates different chromosomal combinations in the daughter cells.
Telophase I: Each of the homologous pairs chromosomes is already in the corresponding poles, and the nuclear membrane forms again in each pole.
2. In the second phase, Meiosis II:
Prophase II: Chromosomes condensate again and become visible.
Metaphase II: Chromosomes join the spindle apparatus and migrate to the equatorial plane, where they randomly line up. Sister chromatids are holden together until they reach the Anaphase.
Anaphase II: Centromeres divide, chromatids get separated, and each of them goes forward an opposite cellular pole.
Telophase II: Once in the poles, the chromosomes became lax again, and cytokinesis occurs.
In the exposed example
During meiosis I, homologous chromosomes are together until anaphase. During meiosis II, after the reduction stage, there are haploid cells. The set of chromosomes of these haploid cells does not have homologous pairs.
