What is meiosis and how does it help to have same number of chromosomes as of parents to offsprings
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Meiosis is a type of cell division that results in four daughter cells each with half the number of chromosomes of the parent cell, as in the production of gametes and plant spores.
At first the cells have the same number of chromosomes as mitosis. DNA replication occurs, giving a total of 46 chromosomes (or 23 chromosome pairs) and 92 chromatids (or 46 chromatid pairs).
Meiosis I: In meiosis I, the homologous chromosomes separate. In this case, the pairs of sister chromatids are still attached to each other. So at this stage, the daughter cells get 23 chromosomes each (of the pair of homologous chromosomes) and 46 chromatids in total (which are actually 23 pairs of sister chromatids attached at the centromere). This is known as reductional division, as the total number of chromosomes is halved at this stage.
Meiosis II: Meiosis II follows the same division as mitosis, except that there are only half as many chromosomes. So the 23 chromatid pairs from the previous cells (or 46 chromatids in total) split equally, so each daughter gets 23 chromatids exactly, which correspond to 23 chromosomes. Meiosis II is known as equational division.
So to summarize, in mitosis, the total number of chromosomes is unchanged in the daughter cells; whereas in meiosis, the total number of chromosomes is halved in the daughter cells.
HOPE IT IS MOST HELPFUL!!!!!!!!!!!!!!
At first the cells have the same number of chromosomes as mitosis. DNA replication occurs, giving a total of 46 chromosomes (or 23 chromosome pairs) and 92 chromatids (or 46 chromatid pairs).
Meiosis I: In meiosis I, the homologous chromosomes separate. In this case, the pairs of sister chromatids are still attached to each other. So at this stage, the daughter cells get 23 chromosomes each (of the pair of homologous chromosomes) and 46 chromatids in total (which are actually 23 pairs of sister chromatids attached at the centromere). This is known as reductional division, as the total number of chromosomes is halved at this stage.
Meiosis II: Meiosis II follows the same division as mitosis, except that there are only half as many chromosomes. So the 23 chromatid pairs from the previous cells (or 46 chromatids in total) split equally, so each daughter gets 23 chromatids exactly, which correspond to 23 chromosomes. Meiosis II is known as equational division.
So to summarize, in mitosis, the total number of chromosomes is unchanged in the daughter cells; whereas in meiosis, the total number of chromosomes is halved in the daughter cells.
HOPE IT IS MOST HELPFUL!!!!!!!!!!!!!!
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The type of cell division in which the number of chromosomes is reduced to 1 set is called as meiosis division.
human consist off 23 pairs of chromosomes means it has two sets of chromosome
as in sexual reproduction both the parents are involved moreover the gametes formed fuse together
during the formation of the gametes meiosis division is used h e n c e the Protoplasm or the germplasm of the g a m e t e s include only one set of chromosomes and when both the gametes fuse together they restore the total No. of chromosomes i.e., 23 pairs of chromosomes.
human consist off 23 pairs of chromosomes means it has two sets of chromosome
as in sexual reproduction both the parents are involved moreover the gametes formed fuse together
during the formation of the gametes meiosis division is used h e n c e the Protoplasm or the germplasm of the g a m e t e s include only one set of chromosomes and when both the gametes fuse together they restore the total No. of chromosomes i.e., 23 pairs of chromosomes.
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