Meiosis Graphic OrganizerMeiosis Graphic OrganizerMeiosis Graphic OrganizerMeiosis Graphic OrganizerFor this Activity You will Need:For this Activity You will Need:

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Why is Meiosis Important?

MEIOSIS Sperm = 23 chromosomes

Egg = 23 chromosomes

Zygote = 46 chromosomes

Fertilization

MITOSIS

Goal of Meiosis

• THINK! – What is the goal of meiosis? Fill the answer into the box on your graphic organizer.

– To create 4 sex cells (sperm or egg) each with HALF the number of DNA molecules (chromosomes) as the original cell

Interphase I

DNA Replicates (doubles)

Prophase I

Chromosome pairs match up

(1 from mom & 1 from dad)

Let’s say the normal chromosome # is 4…

Metaphase I

Chromosome pairs line up in the middle of the cell

Anaphase I

Chromosome pairs split.

NO centromere breaking!

Telophase I

Cells TEAR!

Cytokinesis I

Cells split apart into two!

Interphase II

NO DNA Replication

(no doubling as must reduce the chromosome # in half)

Prophase II

Duplicated chromosomes appear.

Metaphase II

Duplicated Chromosomes line up in the middle of the cells

Anaphase II

Duplicated Chromosomes split.Centromeres break.

Telophase II

Cells TEAR!

Cytokinesis II

Cells Split into 4 Sex Cells

2 2 2 2

• United Streaming Video Clip: Meiosis (3:48)

• Meiosis Animation_Glencoe

– Pay attention to these video clips to see meiosis in action.

Meiosis Video Clips