Chromosome Number, Fertilization MIX


Chromosome Number, Fertilization MIX

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  1. Chromosome Number, Fertilization

    Slide 1 - Chromosome Number, Fertilization

  2. Review

    Slide 2 - Review

    • There are two ways living things can reproduce: asexually and sexually
    • Reproduction passes DNA on to the next generation; DNA carries all the information needed to make a new living thing!
    • DNA can coil itself into a condensed structure called a chromosome; this only happens during cell division
    • Meiosis is a special type of cell division that takes place only in the sex organs
    • Meiosis the type of cell division that produces gametes (egg, sperm)
    • Gametes contain half the amount of DNA as all the other cells in the body of the organism
  3. Chromosome Number

    Slide 3 - Chromosome Number

    • For living things that reproduce sexually (like us, most animals and plants), we use two terms to describe the amount of DNA in a cell
    • Diploid = a cell that contains TWO copies of each type of chromosome (or piece of DNA)
    • Most normal body cells are diploid
    • Diploid cells have 50% of the DNA from each parent
  4. Slide 4

    • Haploid =a cell that contains only ONE copy of each type of chromosome (or piece of DNA)
    • Only GAMETES are haploid
    • Haploid cells RESULT FROM MEIOSIS
  5. To Sum Up:

    Slide 5 - To Sum Up:

    • In sexually reproducing organisms, the process of MEIOSIS produces HAPLOID GAMETES in the SEX ORGANS

    Slide 6 - How to (BIOLOGICALLY) MAKE A BABY!



    • Fertilization is the process of joining GAMETES. The very first cell that results from the joining of these cells is called a ZYGOTE. This is the first cell that contains a complete set of DNA.