
How many divisions are there in meiosis?
Answer
483.3k+ views
Hint: Meiosis is the mechanism in which four haploid cells are formed by a single cell that divides twice. Meiosis is a form of division of cells that decreases by half the number of chromosomes in the parent cell and creates four gamete cells.
Complete answer:
The development of eggs and sperm cells for sexual reproduction involves this process. During reproduction, the number of chromosomes is returned in the offspring as the sperm and egg combine to create a single cell.
Meiosis I (Reduction) and Meiosis II, two consecutive nuclear divisions, occur (Division). 4 haploid cells are formed by Meiosis. 2 diploid cells are formed by mitosis. Reduction/ Separation was the old name for meiosis. Meiosis I decreases the level of ploidy from 2n to n (reduction), while Meiosis II in a mitosis-like mechanism splits the remaining chromosome collection (division). During Meiosis I, much of the variations between the processes exist.
Meiosis has both similarities to and variations from mitosis, which is a mechanism of cell division in which two identical daughter cells are formed by a parent cell. Meiosis occurs in the male or female sex organs after one round of DNA replication in cells. The mechanism is divided into meiosis I and meiosis II, and there are several stages of both meiotic divisions. Meiosis I, though meiosis II is similar to mitosis, is a form of cell division specific to germ cells.
The first meiotic separation, Meiosis I, starts with prophase I. The DNA and protein complex known as chromatin condenses during prophase I to form chromosomes. The pairs of replicated chromosomes are known as sister chromatids, and at a central point called the centromere, they remain joined. A large structure called the meiotic spindle also arises on either side, or pole, of the cell from long proteins called microtubules. The pairs of homologous chromosomes form tetrads between prophase I and metaphase I.
Note: The chromosomes are wrapped in the nuclear membranes during Telophase II. It is preceded by cytokinesis, separating the cytoplasm of the two cells. There are four haploid daughter cells at the end of meiosis that begin to grow into either sperm or egg cells.
Complete answer:
The development of eggs and sperm cells for sexual reproduction involves this process. During reproduction, the number of chromosomes is returned in the offspring as the sperm and egg combine to create a single cell.
Meiosis I (Reduction) and Meiosis II, two consecutive nuclear divisions, occur (Division). 4 haploid cells are formed by Meiosis. 2 diploid cells are formed by mitosis. Reduction/ Separation was the old name for meiosis. Meiosis I decreases the level of ploidy from 2n to n (reduction), while Meiosis II in a mitosis-like mechanism splits the remaining chromosome collection (division). During Meiosis I, much of the variations between the processes exist.
Meiosis has both similarities to and variations from mitosis, which is a mechanism of cell division in which two identical daughter cells are formed by a parent cell. Meiosis occurs in the male or female sex organs after one round of DNA replication in cells. The mechanism is divided into meiosis I and meiosis II, and there are several stages of both meiotic divisions. Meiosis I, though meiosis II is similar to mitosis, is a form of cell division specific to germ cells.
The first meiotic separation, Meiosis I, starts with prophase I. The DNA and protein complex known as chromatin condenses during prophase I to form chromosomes. The pairs of replicated chromosomes are known as sister chromatids, and at a central point called the centromere, they remain joined. A large structure called the meiotic spindle also arises on either side, or pole, of the cell from long proteins called microtubules. The pairs of homologous chromosomes form tetrads between prophase I and metaphase I.
Note: The chromosomes are wrapped in the nuclear membranes during Telophase II. It is preceded by cytokinesis, separating the cytoplasm of the two cells. There are four haploid daughter cells at the end of meiosis that begin to grow into either sperm or egg cells.
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