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ALL CIE BIOLOGY DOUBTS HERE !!!
**RoRo**:
Question... Explain why cells that are produced as a result of mitosis are genetically identical. [3 marks]
ashish:
--- Quote from: The Secret on December 04, 2010, 07:39:21 am ---Question... Explain why cells that are produced as a result of mitosis are genetically identical. [3 marks]
--- End quote ---
during cell division, the DNA from the parent cell is taken as template. Both sister chromatids move to the opposite sides during metaphase and during interphase the chromatids replicate to form Chromosomes. since DNA is taken from a single parent cell they are genetically identical
**RoRo**:
--- Quote from: ashish on December 04, 2010, 10:38:38 am ---during cell division, the DNA from the parent cell is taken as template. Both sister chromatids move to the opposite sides during metaphase and during interphase the chromatids replicate to form Chromosomes. since DNA is taken from a single parent cell they are genetically identical
--- End quote ---
Thanks Ashish!! :)
**RoRo**:
Okay, here's a couple of questions straight from the syllabus, I want to know what points should be mentioned under these questions:
1. Explain the importance of mitosis in growth, repair and asexual reproduction.
2. Explain the need for the production of genetically identical cells and fine control of replication.
3. Explain the need for meiosis prior to fertilization in sexual reproduction.
NOTE: They all belong to the chapter: Cell and Nuclear Division
Thanks a lot in advance! :)
Deadly_king:
--- Quote from: The Secret on December 04, 2010, 06:08:46 pm ---Okay, here's a couple of questions straight from the syllabus, I want to know what points should be mentioned under these questions:
1. Explain the importance of mitosis in growth, repair and asexual reproduction.
2. Explain the need for the production of genetically identical cells and fine control of replication.
3. Explain the need for meiosis prior to fertilization in sexual reproduction.
NOTE: They all belong to the chapter: Cell and Nuclear Division
Thanks a lot in advance! :)
--- End quote ---
1. Mitosis is important in these cases so as to replace dead cells with new identical ones which will carry out the same function as the others preceding it. Hence this is to ensure the survival of this particular species.
Example : (i) The body cells of a child undergoes mitosis for growth so that the child becomes bigger and have more developped organs which will be more efficient in their respective jobs.
2. Identical cells should be produced to ensure the survival of the respective species as well as the genes coding for it. If the cells are not identical the organism is going to be affected as the same genes will not be present and hence will not be able to carry out the wanted function.
3. Meiosis is required to half the number of chromosome in each gamete. This will ensure that upon fertilization the required number of chromosomes will be restored. In other words it prevents the number of chromosome to double each generation.
Example : (i) In man, we have 46 chromosome in each cell. Our body produces gamete with half the number of chromosome(23) such that at fertilization two gametes combine together to form one cell. Hence number of chromosome is restored. (23 + 23 = 46)
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