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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

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Process of meiosis

Process of meiosis


Unit 08

Lesson 02

Asexual vs sexual reproduction

Asexual vs. sexual reproduction

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

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