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HW LS 2d Meiosis

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Kirby Francis

on 26 January 2015

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Transcript of HW LS 2d Meiosis

Interphase
1. Cell gets bigger
2. Chromosomes are copied
!
3. The cell performs normal functions
MITOSIS: Prophase
1. Nucleus starts to dissolve
2. Chromosomes pair up and
are held together by centromere
3. Centrioles appear
MITOSIS: Metaphase
1. Nucleus is gone
2. Centrioles send out fibers to attach to chromosomes.
3. Chromosomes line up in the middle of the cell.
MITOSIS: Anaphase
1. Chromosomes break at centromeres and centrioles pull the chromosomes apart to opposite ends of the cell
MITOSIS: Telophase
1. Cell starts to split.
2. Two twin nuclei form
3. Centrioles disappear
A Cell
Cell Division Begins
Mitosis vs. Meiosis
Prophase I
1. Nucleus starts to dissolve
2. Homologous pairs of chromosomes (23 from Mom and 23 from Dad) pair up
3. Centrioles appear
Metaphase I
1. Nucleus is gone
2. Centrioles send out fibers to attach to chromosomes.
3. Homologous chromosome pairs line up in the middle of the cell.
Anaphase I
1. Homologous chromosome PAIRS are pulled apart to opposite ends (23 pairs on each side).
Telophase
1. Cell starts to split.
2. Two twin nuclei form with half the chromosomes
3. Centrioles disappear
This normal cell has 46 chromosomes.
23 from your Mom, 23 from your Dad. They pair up based on the information. Your face shape chromosome from your Mom will pair up with the face shape chromosome from your Dad.
Cytokinesis I
1. Cytokinesis is different in different types of cells and you'll learn about that in high school.

MEIOSIS: Prophrase II
MEIOSIS: Metaphase II
1. Nucleus starts to dissolve
2. Centrioles appear
1. Nucleus is gone
2. Centrioles send out fibers to attach to chromosomes.
3. Chromosomes line up in the middle of the cell.
MEIOSIS: Anaphase II
1. Chromosomes break at centromeres and centrioles pull the chromosomes apart to opposite ends of the cell
MEIOSIS: Telophase II
1. Cell starts to split.
2. Four nuclei form, 2 pairs of twins
3. Centrioles disappear
MEIOSIS: Cytokinesis II
1. Cytoplasm completely splits and there are four DIFFERENT gametes (sex cells) with 23 chromosomes each (half of what you normally have in each cell!)
2. Meiosis is complete

In Prophase (Mitosis) there are 2x the Chromosomes as in Prophase II of Meiosis
Mitosis




Makes my “toes-es”
Meiosis




Makes a new “ME”
GOAL:
Mitosis
Produces identical cells
to allow growth and repair.
GOAL
Meiosis
Produces cells with half
the original amount of DNA
MITOSIS
Happens in:
BODY CELLS
MEIOSIS
CREATES
REPRODUCTIVE CELLS
Number of cells Made:
Mitosis
Number of cells made:
Meiosis
Effect on DNA:
Mitosis
Amount of DNA is the same
Effect on DNA:
Meiosis
Amount of DNA is
cut in half (1/2)
Type of Reproduction:
ASEXUAL
(exact copy)
Type of Reproduction:
FOR SEXUAL REPRODUCTION
(new gene combinations)
PHASES:
Interphase

Prophase
Metaphase
Anaphase
Telophase
Cytokinesis

Prophase
Metaphase
Anaphase
Telophase
Cytokinesis
PHASES:
Interphase

Prophase
Metaphase
Anaphase
Telophase
Cytokinesis
1 cell w/ 46 chromosomes --> 2 cells w/ 46 chromosomes each
1 cell w/ 46 chromosomes --> 4 cells w/ 23 chromosomes each
MITOSIS: Cytokinesis
1. Cytoplasm completely splits and there are two identical daughter cells.
2. Cell Division is complete
3. Two identical cells, each with 46 chromosomes.
Mitosis
Meiosis
46
Chromosomes
92
Chromosomes
Path for Mitosis
2 Identical Cells,
46 chromosomes each
46
Chromosomes
46
Chromosomes
Path for Meiosis
46
Chromosomes
46
Chromosomes
2 different cells,
46 chromosomes each
23
Chromosomes
23
Chromosomes
23
Chromosomes
23
Chromosomes
4 different gametes,
23 chromosomes each
Remember...
46
Chromosomes
92
Chromosomes
46
Chromosomes
46
Chromosomes
Mitosis
Meiosis
46
Chromosomes
92
Chromosomes
46
Chromosomes
46
Chromosomes
23
Chromosomes
23
Chromosomes
23
Chromosomes
23
Chromosomes
The end
Full transcript