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Meiosis Powerpoint Project

the make-up powerpoint.... 1/15

Ashlynne McNally

on 17 January 2013

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Transcript of Meiosis Powerpoint Project

by Ashlynne McNally Meiosis Powerpoint Meiosis Mitosis Mitosis steps Prophase Interphase Metaphase Anaphase A process in cell division during which the
number of chromosomes decreases by half
the original number by two divisions of the
nucleus, which results in the production of
sex cells There are six steps to mitosis. They are:
Cytokinesis Before mitosis begins, chromosomes are copied.
Each chromosome is then two chramtids The nuclear membrane dissolves and the
chromosomes condense into rodlike
structures during the first stage of Mitosis. In the second phase of mitosis, the chromosomes
line up along the equator of the cell, and the
homologous chromosomes pair up. In the third pase of mitosis, the chromatids
separate and move to opposite sides of the
cell. In eukaryotic cells, a process of cell division that forms two new nuclei, each of which has the same number of chromosomes Telophase During the fourth phase of mitosis, a nuclear
membrane forms around each set of
chromosomes, and the chromosomes unwind. Cytokinesis In cells that lack a cell wall, the cell
pinches in two. In cells that have a cell
wall, a cell plate forms between two new
cells. Meiosis steps Steps of Meiosis 1 &2 There are 11 steps all together in Meiosis 1 &2 Early Prophase 1
Late Prophase 1
Metaphase 1
Anaphase 1
Telophase 1
End of Meiosis 1
Prophase 2
Metaphase 2
Anaphase 2
Telophase 2
End of Meiosis 2 Prophase 1 Early Prophase 1 In early prophase 1, chromosomes and centrioles
duplicate, and the centrioles begin to move Late Prophase 1 In late prophase 1, chromosomes line up in
homologous pairs and the spindle begins to
form Metaphase 1 In this phase, chromosomes line up on
a metaphase plate and microtubules attach
to one homologue each. Anaphase 1 In this phase, microtubules pull and
separate pairs of chromosomes. Telophase 1 In this phase, the cell membrane
constricts and chromosome are
surrounded by nuclear material End of Meiosis 1 In this phase, there are two cells. Chromosomes are still duplicating, so Meiosis 2 begins. Prophase 2 Just like Prophase 1, the cells duplicate centrioles and form spindles Metaphase 2 Just like in Meiosis 1, chromosomes line up
along the equator of the cells Anaphase 2 Just like in Anaphase 1, the spindle
fibers pull the chromosomes apart Telophase 2 Just like in Telophase 1, the cell membrane
constricts, and the nuclei form End of Meiosis 2 At the end of Meiosis 1 and 2,
there are four sister cells Similarities in
Mitosis and Meiosis ~ Both Meiosis and Mitosis have the
steps Prophase, Metaphase, Anaphase,
and Telophase ~ Both are ways cells duplicate themselves Differences in Mitosis
and Meiosis ~Meiosis occurs twice ~ Meiosis is sexual production, whereas Mitosis
is asexual reproduction
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