PART - 2 CH - 7 How do Organisms Reproduce ? — Science STD 10 — Question
Gujarat BoardEnglish MediumSTD 10SciencePART - 2 CH - 7 How do Organisms Reproduce ?3 Marks
Question
Explain cell reproduction and tendency for variation inbuilt during cell reproduction.
✓
Answer
Cell reproduction means cell division. $\rightarrow$ A parent cell divides into two daughter cells. $\rightarrow$ The creation of a DNA copy is the basic event in the process of reproduction. $\rightarrow$ Cells usually use chemicals to build copies of their DNA. $\rightarrow$ This process results in the production of two similar copies of DNA in a reproducing cell. $\rightarrow$ The two copies of the DNA molecule, which are similar with each other, come to two daughter cells. $\rightarrow$ Therefore. DNA copying is always accompanied by the creation of another cellular apparatus. $\rightarrow$ Finally, the DNA copies are seperated into two similar cells, each with its own cellular apparatus. $\rightarrow$ Finally, a cell divides to give rise to two daughter cells. $\rightarrow$ So, only creation of a DNA copy is not sufficient for cell division.
Two daughter cells produced by cell division are similar, however they are not likely to be absolutely identical. This is because some variations may arise during the process of copying the DNA. As a result, the DNA copies generated will be similar, but may not be identical to the original. Some of these copies of DNA may possess such drastic variation from the original that their survival becomes difficult. Such a new born cell will simply die. On the other hand, some other variations in the DNA copies may be beneficial which can help the cell to survive with slight variation. Thus, the surviving cells are different from each other with slight variation in their features. This is how tendency for variation is inbuilt during cell reproduction.
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