Question

Сколько фаз у мейоза? и как называются

Answer 1

2 периода, по 4 фазы в каждом:
Профаза 1
Метафаза 1
Анафаза1
Телофаза1
Завершается 1 этап, перерыв и дальше начинается 2 этап
Профаза 2
Метафаза 2
Анафаза2
Телофаза2

Answer 2

Meiosis and its Phases

Meiosis is a specialized type of cell division that occurs in sexually reproducing organisms. It involves the production of gametes (sperm and eggs) with half the number of chromosomes as the parent cell. Meiosis consists of two main phases: meiosis I and meiosis II.

Meiosis I is the first division of meiosis and consists of the following phases:

1. Prophase I: This is the longest phase of meiosis and can be further divided into five subphases: leptotene, zygotene, pachytene, diplotene, and diakinesis. During prophase I, homologous chromosomes pair up and undergo genetic recombination through a process called crossing over. 2. Metaphase I: In this phase, the homologous chromosome pairs align at the equator of the cell. 3. Anaphase I: The homologous chromosomes separate and move towards opposite poles of the cell. 4. Telophase I: The chromosomes reach the opposite poles of the cell, and the nuclear envelope reforms around each set of chromosomes. Cytokinesis then occurs, resulting in the formation of two haploid daughter cells.

Meiosis II is the second division of meiosis and is similar to mitosis. It consists of the following phases:

1. Prophase II: The nuclear envelope breaks down, and the spindle apparatus forms. 2. Metaphase II: The chromosomes align at the equator of the cell. 3. Anaphase II: The sister chromatids separate and move towards opposite poles of the cell. 4. Telophase II: The chromosomes reach the opposite poles of the cell, and the nuclear envelope reforms around each set of chromosomes. Cytokinesis then occurs, resulting in the formation of four haploid daughter cells.

In summary, meiosis consists of two divisions: meiosis I and meiosis II. Meiosis I involves the pairing of homologous chromosomes and genetic recombination, while meiosis II is similar to mitosis and involves the separation of sister chromatids.

Please let me know if there's anything else I can help you with!