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Cell Division: Meiosis and Mitosis

Just for Biology Class
by

Karizza Vicente

on 24 January 2013

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Transcript of Cell Division: Meiosis and Mitosis

Meiosis and Mitosis Cell Division Cell Division Conclusion - the process by which a parent cell divides into two or more daughter cells

- cells need to make another cells thus division of cells takes place Meiosis is a two-part cell division process in organisms that sexually reproduce.

Meiosis produces gametes with one half the number of chromosomes as the parent cell.

There are two stages of meiosis: meiosis I and meiosis II. At the end of the meiotic process, four daughter cells are produced. MEIOSIS Gametes of Male and Female MITOSIS MEIOSIs CELL DIVISION MEIOSIS MITOSIS Two types of
Cell Division Somatic Cells also known as GAMETES cells Let's Absorb it First =) Four Mitosis Stages INTERPHASE A typical cell goes through a process of growth, development, and reproduction called the cell cycle.

Most of the cycle is called Interphase. Cell Cycle There are three main reasons

growth
repair/healing
asexual reproduction Reasons for Mitosis Prophase
Metaphase
Anaphase
Telophase The Basic Phases of a Cell’s Life:

1. Division of the nucleus
2. Also called Karyokinesis
3. Only occurs in eukaryotes
4. Has four stages
5. Doesn’t occur in some cells such as brain cells Mitosis Metaphase Prophase Why Do Cells Divide? The larger a cell becomes, the more demands the cell places on it's DNA.
It also has more trouble moving enough food and wastes across its cell membrane. 1. In prophase, the cell begins the process of division.
2. The nuclear membrane breaks apart
3. The chromosomes condense. Metaphase plate Centriole Centriole The chromosomes line up at the equator of the cell (metaphase plate), with the centrioles at opposite ends and the spindle fibers attached to the centromeres. Spindle fibers There's more!! :) Meiosis is Two cell divisions
(called meiosis I and meiosis II)
with only one duplication of chromosomes. Haploid Diploid Meiosis II Diploid Sister
chromatids
separate Homologs
separate Meiosis: Two Part Cell Division Meiosis I Sperm (23) + Egg (23) = Fertilized Cell (46) = + The Male Gamete is the Sperm and is produced in the male gonad the Testes.

The Female Gamete is the Ovum (ova = pl.) and is produced in the female gonad the Ovaries. Meiosis in males is called Spermatogenesis and produces sperm.

Meiosis in females is called Oogenesis and produces ova. X A X A Mature
egg X a X a X A X a X X A a Second
polar body
(haploid) Ovum (egg) Polar
bodies
die First polar body
may divide
(haploid) (if fertilization
occurs) Meiosis II Secondary
oocyte
(haploid) Meiosis I Primary
oocyte
(diploid) Mitosis Oogonium
(diploid) Oogenesis Should be balance PROCESS OF MEIOSIS Telophase I (diploid) Anaphase I Metaphase I Late Prophase I Early Prophase I
(Chromosome number doubled) Nucleus Nuclear
envelope Spindle
fibers Meiosis I: Reduction Division Gene X Sister chromatids carry
identical genetic
information. Meiosis II produces gametes with
one copy of each chromosome and thus one copy of each gene. Only one homolog of each chromosome is present in the cell. Meiosis II Gametes (egg & sperm) form

Four haploid cells with one copy of each chromosome

One allele of each gene

Different combinations of alleles for different genes along the chromosome Results of Meiosis Thanks for not sleeping :) Created by : Vicente If you have any questions
just ask :) To be reported by: Huertas, Aguila, Villano, Padua, Cusi
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