8/16/2011

3.1- Sexual and Asexual reproduction

Describe the differences between sexual and asexual reproduction.
  1. Organisms that show sexual reproduction show sexes( male/ female), no such sexes exist in asexual reproduction.
  2. Sexually reproducing organisms produce cells called GAMETES (sperm/egg). In plants the sperm cell is known as the pollen grain and the egg cell is know the ovule. Asexually reproducing populations have no gametes.
  3. The type of cell division that produces gametes is known as MEIOSIS. It has a number of effects and one of them is half the chromosomes in the gamete cell. In humans, the totals number of chromosomes per cell is 46, whereas, in a gamete cell there are 26 per cell (through MEIOSIS). In asexually reproducing population there is MITOSIS in Eukaryotic cells and binary fission in prokaryotic cells. In this process the number of chromosomes are maintained constantly. 
  4. In sexually reproducing population, we find the process of fertilisation, in which the male gamete fuses with the female gamete. In asexual reproduction, there is no cell fusion.
  5. If we examine the population of a sexually reproducing organisms we will find broad variation and in asexually reproducing populations there will be small variations due to mutations. By enlarge they are identical, this is known as a clone. 

Question: What are eukaryotic and prokaryotic cells?

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