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Process of meiosis. CSCOPE Unit 08 Lesson 02. Asexual vs. sexual reproduction. Asexual vs. sexual reproduction. What is the advantage of an organism that reproduces sexually rather than asexually?

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process of meiosis
Process of meiosis


Unit 08

Lesson 02

asexual vs sexual reproduction1
Asexual vs. sexual reproduction
  • What is the advantage of an organism that reproduces sexually rather than asexually?
    • An organism that reproduces sexually will have more genetic diversity than one that reproduces asexually.
meiosis i
Meiosis i
  • Four Phases:
    • Prophase I
    • Metaphase I
    • Anaphase I (and)
    • Telophase I
  • Genetic diversity results from meiosis I.
prophase i
Prophase I
  • Homologous (same) chromosomes pair (synapsis)
  • Homologous pairs called bivalents—two chromosome with four chromatids
  • Nuclear membrane dissolves
  • Chromosomes attach to spindle fibers and begin to move
metaphase i
Metaphase I
  • Homologous chromosomes (bivalents) line up at the equator to form tetrads.
  • Random orientation results in diversity.
  • 50/50 chance of getting either parent’s homologue for each chromosome


anaphase i
Anaphase I
  • Homologous chromosomes separate.
  • Chromosomes with TWO chromatids move to opposite poles.
  • Daughter cells will have 23 chromosomes (haploid) but with two chromatids.
telophase i
Telophase I
  • Nuclear membrane begins to reform
  • Cell may quickly move to meoisis II
meiosis ii
Meiosis II
  • Similar to mitosis BUT no synthesis phase (no DNA replication)
  • Chromatids are NOT identical because of crossing over (recombination).
  • Separates chromatids and produces two daughter cells with 23 chromosomes that have one chromatid each
important concepts
Important Concepts!!!
  • Crossing Over: Exchange of genetic information between homologous chromosomes that results in recombinant chromosomes and genetic diversity
important concepts1
Important Concepts!!!
  • Independent Assortment: Chromosomes randomly line up during metaphase I, and there are various ways that the homologous chromosomes may line up—again resulting in genetic diversity