science

• Neurons are specialized cells that transmit electrical impulses to other neurons or muscles.
• Reproduction is the process by which living organisms produce new individuals similar to themselves
• Reproduction ensures continuity of life on earth
• Reproduction is a bridge to hereditary transmission
• Reproduction involves the continuation of characters from the parents to daughter cells by copying of DNA (Deoxyribose Nucleic Acid) molecules present in the chromosomes of the cell
• Copying of DNAs is not foolproof, even minute changes bring about variation in the blueprint of the offspring
• Useful variations are retained while harmful ones do not go beyond
• Variations help the species withstand drastic environmental changes, saving the species from extinction and promoting its survival for a longer time
• This inbuilt tendency of variation is the "fuel" for Evolution
• Asexual Reproduction:

  • A single parent is involved
  • Gametes are not formed
  • Progeny is identical to the parent (e.g., Fission in Amoeba)
  • Asexual Reproduction is extremely useful as a means of rapid multiplication and is common in lower plants and animals
• Sexual Reproduction:

  • Both parents are involved
  • Gametes are formed
  • Progeny is only genetically similar to the parent
• Different forms of Asexual Reproduction:

  • Fission: the parent cell divides/splits into two daughter cells (Binary Fission) or splits into many cells (Multiple Fission)