IQ2

• How does DNA replication effect the continuity of a species

  • DNA is fundamental heredity unit, which directs all processes in a cell
  • Reproduction of cells is dependent upon DNA replication, as the creation of new cells requires more DNA to be produced
  • By coping the genetic material of a cell, replication ensure that important information important for life is transferred down through generations
  • If DNA were not replicated before mitosis or meiosis, cell division would halve the amount of DNA, resulting in the cells dying due to inadequate genetic information
• How does mitosis effect the continuity of a species

  • Mitosis is essential for the development and growth of an organism. Mitosis increases the number of cells in an organism, allowing for the development of a multicellular body
  • Mitosis also allows for old cells to be replaced, ensuring that tissue continue to function effectively and efficiently 

  • Some organisms reproduce asexually, which is facilitated by mitosis. In these cases, mitosis creates the next generation of organisms.
• Hoe does meiosis effect the continuity of a species

  • gametes are the end product of meiosis - haploid cells with Half the number of requisite chromosomes to make a happy, full cell capable of all the things cells can do
  • The combination of gametes during sexual reproduction creates new organisms, which have inherited traits from both parents.
  • unlike mitosis, meiosis purposefully introduces variation. Process of crossing over independent assortment and random segregation allowing for combinations of diff alleles, increasing variation in offspring and the wider pop.
• Semi- conservative model 


  , the two strands of DNA unwind from each other, and each acts as a template for synthesis of a new, complementary strand. This results in two DNA molecules with one original strand and one new strand.
• Model of DNA ( Watson and Crick)

  Deoxyribose nucleic acid, or DNA is a double helical nucleic acid molecule, which carries genetic information encoded as a sequence of nucleotide bases.

  A single nucleotide is a phosphate is bounded to a deoxyribose sugar group which is bounded to a nucleotide base
• Chromatin 


  Chromatin is a complex of DNA and protein found in eukaryotic cells. The primary function is to package long DNA molecules into more compact, denser structures.
• Histones 


   A type of protein found in chromosomes. Histones bind to DNA, help give chromosomes their shape, and help control the activity of genes.