By: Maryn S.

Introduction

Cell division and reproduction Mitosis

when the nucleus of a eukaryotic cell divides. Replacing worn out cells and producing offspring

identical to parent

Meiosis The division of a cell and its nucleus that

produces haploid daughter cells Ensures fertilization with proper chromosome

numbers

Interphase

G1 cell carries out normal functions does not reproduce

S chromosomes inside the cell replicate (sister chormatids)

Sister chormatids are held together near the middle of the centromere

ensures replication of cells by cell division are identical G2

cell continues to grow organelles replicate

Mitosis (start of the Mitotic stage) when the nucleus of a eukaryotic cell

divides. Importance of Mitosis

replacing old, wore out, or dead cells reproducing offspring identical to the

parent (asexual reproduction)

Phases of Mitosis

Prophase Metaphase Anaphase Telophase

Prophase

The first step in Mitosis Major events

the replicated chromosomes of DNA coil tightly together the membrane around the nucleus breaks apart

allowing the chromosomes to move to freely around the cell

Metaphase

The second phase of Mitosis Major events

Hair-like fibers move replicated chromosomes to the middle of the cell

replicated sister chromatids align at the middle of the cell

Anaphase

The Third phase of Mitosis Major events

Hairlike fibers attach to the sister chromatids of every replicated chromosomes

Fibers pull and separate replicated chromatids to opposite ends of the cell

chromatids begin being called chromosomes

Telophase

The fourth phase of Mitosis Major events

A new membrane forms around each set of chromosomes

Coiled chromosomes begin to unwind There are two new chromosomes that are

identical to the original one The cell has not yet divided

Cytokinesis

The final phase of cell division Major events

The cytoplasm and its components divide into two identical daughter cells

(jello) Cell Pictures of Mitosis

Meiosis

The division of a cell and its nucleus that produces haploid daughter cells

Importances It ensures the common chromosme

inheritance numbers Ensures fertilization with proper number of

chromosomes

Sexual Reproduction (Meiosis) The production of an offspring that results when

the genetic materials from two different cells combine.

Advantages Genetic variation Selective breeding

Disadvantages Difficulties of sperm and egg fertilization Time spent to grow and develop to be able to

reproduce

Asexual Reproduction(Mitosis) The production of offspring by one

parent without a sperm and an egg joining

Advantages Does not require a mate Less time input for more reproduction Identical offspring is well developed for the same

environment (cloning) Disadvantages

Lack of genetic variation Genetic mutations that pass through generations

Conclusion

Cell division and reproduction Mitosis

when the nucleus of a eukaryotic cell divides. Replacing worn out cells and producing offspring identical to

parent

Meiosis The division of a cell and its nucleus that produces

haploid daughter cells Ensures fertilization with proper chromosome numbers

In both ways of reproduction there is still the foundation of the process cell division.

Thank You!!!

Bibliography

http://botit.botany.wisc.edu/images/130/Meiosis/Lilium_microsporogenesis/Meiosis_1.low.jpg

http://wwwdelivery.superstock.com/WI/223/1436/PreviewComp/SuperStock_1436R-196024.jpg

http://dogtime.com/system/gallery_pictures/26/large/Golden-Retriever-puppy-3-picture.jpg

http://research.nmsu.edu/molbio/bioinfo/tutorials/clip_art/images/mitosis.jpg

http://upload.wikimedia.org/wikipedia/commons/7/7b/MajorEventsInMeiosis.jpg

National Geographic, Focus on Life Science; McGraw Hill, 2007