biology b5 groteh and devlopment

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  • Created by: Anna Wood
  • Created on: 20-06-13 09:37
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  • b5 growth and development
    • meiosis
      • tasks place in testis or ovaries
        • makes gametes
          • has only half chromosomes
      • creates 4 different gametes
      • used for sexual reproducing
    • miosis
      • mitosis occurs when
        • growth
        • repair
        • replace
      • diversion of cells tom make not cells
        • makes 2 identical daughter cells
      • for mitosis to take place the cell goes through growth and division
        • growth
          • number of organelles increase
          • chromosomes are copied
            • two strands of dna separate new stands form alongside
        • division
          • copied chromosome separate
          • cell divides
      • variation
        • meiosis and sexual reproduction creates variation
        • when gametes fuse genetic information from two individuals combined
        • only one of parents allelesis passed on
          • each offspring can have different combination
            • each offspring is different
    • fertilisation
      • male gamete and female gamete fuse together to produce a single body cell
        • zygote is formed
          • had full number of chromosomes
            • in each new pair of chromosomes
              • one from farther
              • one from mother
          • divides by mitosis
            • cluster of cells are called a embryo
              • finally turns into a baby
    • genetic information
      • genes control characteristics by providing information
        • instruction are formed a code
          • made up of four bases
            • hold two stands of dna in a double helix
            • a always pairs with t
            • g always with c
      • each gene is a code for specifics protein
        • they join in thee in this call triplet
          • each of these triplet sort out a amino acid
    • controlling growth and development
      • dna is too large to leave nucleus
        • so stay inside nucleus
        • the production of protein happens in cytoplasm
          • the transfer is done in the following way
            • the relevant section of dna is unzipped
              • instruction are copied onto smaller molecues
                • these smaller molcules are called messenger RNA
                  • these molecules leave the nucleus
                    • carrying  information to the ribosome
                      • when the protein is made


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