Chromosome number become half in which stage of meiosis
Answers
Each chromosome is made up of two identical chromatids, known as sister chromatids. The pair of chromosomes within a cell is called homologous chromosomes. Thus, there are a total of four chromatids in a cell, which are collectively called a tetrad.
During prophase I, the homologous chromosomes begin to condense and come towards each other by a process called synapsis.
After synapsis, crossing over takes place.
Crossing over is the exchange of equivalent sections of chromatids between the homologous chromosomes.
The chromosomes begin to thicken and move away from the nuclear envelope.
Metaphase I
In metaphase I, the tetrads get aligned at the center of the cell, at the equatorial plane.
The centromeres, a region in the chromosome where the chromatids are held together are located at the opposite poles.
Anaphase I
The homologous chromosomes separate during this stage.
The chromosomes migrate to the opposite poles of the cell.
The sister chromatids remain together at this stage.
Telophase I
The chromosomes continue to migrate towards the poles.
Both the poles have haploid number of chromosomes.
Condensation of the chromosomes and cytokinesis (division into two cells) takes place.
A nuclear envelope starts forming.
Two daughter cells with a haploid chromosome number are formed.
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The chromosome number is reduced by half by cytokinesis related to telophase
Anaphase I is when the homologous chromosomes separate and begin moving towards opposite poles of the cell … but the two poles are still in the same single cell. It is not until the cell physically divides in two that any cell has half the chromosome number of the parent cell.
After cytokinesis of meiosis I, each of the two daughter cells is haploid (half the number of chromosomes as the parent cell) , but each chromosome is still a double structure, consisting of 2 sister chromatids linked at their centromere. In meiosis II each chromosome will have its two sister chromatids split (disjoined) in anaphase II and then each ‘sister chromatid’ is considered to be its own chromosome.
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