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Standard IX
Biology
Meiotic Cell Division
Why the chrom...
Question
Why the chromosomes number has reduced into half in daughter cells during meiosis division?
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Solution
Meiosis:
Meiosis is a type of cell division that is also called as reduction cell division.
The process results in four daughter cells that are haploid, which means they contain half the number of chromosomes of the diploid parent cell.
The number of chromosomes in human cells are 46. i.e, these are present in pairs of 23.
These pairs break apart and get separated in meiosis I.
Thus, each of the two daughter cells formed after first meiotic division have half the number of chromosomes, i.e., 23.
Now each of the 23 chromosomes have two identical chromatids.
So, in meiosis II, these chromatids get separate and in total 4 cells result.
These four cells are haploid and are known as gametes, i.e., sperm or ovum.
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Q.
In Meiosis, the chromosome number in the daughter cells are reduced to half that of their parent cells. Guess, what would happen, if the reduction of chromosome number is not done?
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Assertion: During meiotic cell division, the chromosome content of the daughter cells is halved by the end of meiosis I itself. Yet, meiosis II is essential for generation of haploid cells.
Reason: During meiosis II, the duplicated sister chromatids separate from each other and are distributed into the haploid daughter cells.
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A cell has 20 chromosomes. The number of chromosomes in the daughter cells after meiosis is ___________.
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A cell has 20 chromosomes. The number of chromosomes in the daughter cells after meiosis is ___________.
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