Transcript Sasha Gerard

Sasha Gerard
What is Meiosis Anyway?
 Meiosis is the process of the division of cells to
create two new nuclei, each containing an
identical copy of DNA.
 During meiosis, the chromosome pairs separate
and are distributed to two different cells. The
resulting sex cells have only half as many
chromosomes as the other cells in the organism.
 If you’re a male, your body uses meiosis to create
sperm cells. If you’re a female it uses meiosis to
create egg cells.
If You Still Don’t Understand,
Maybe This Can Help
 Here is a diagram of
the process of
meiosis. By
following the
arrows, you can see
the process step by
step. You can see
the events that
occur during
meiosis.
What Are Genes?
 A gene is a section of a chromosome. It
carries coded information in a sequence of
chemicals. When it’s necessary, a part of
this information can be decoded and used to
provide the recipe for protein combinations
within the cell.
Do You Need a Picture to
Understand Better?
Here is a picture of a
chromosome. You
can see where the
gene is located on
the inside and on the
side it is magnified for
you. As can see, the
genes are located
inside of DNA.
What Are Chromosomes?
•Chromosome are structures within a cell which
contain the genetic information that is passed
on from one generation to the next.
•In prokaryotes, there is usually a large circular
chromosome. Sometimes there can also be
several smaller circular chromosomes called
plasmids. They drift around in the cytoplasm in
a prokaryote cell.
•In eukaryotes, most chromosomes are located
in the cell nucleus and are made up of protein
and DNA.
What Role Does a Chromosome
Play in Inheritance?
•You have 46
chromosomes, 23
from your father
and 23 from your
mother. When an
egg cell and a
sperm cell
combine to make
a fertilized egg,
their
chromosomes
combine to make
46 chromosomes.
Here is a Picture of a Chromosome
If you look close
enough you can
see the DNA
molecules which
contain the genes
What is the Relationship Between
Chromosomes and Genes?
•Chromosomes are made up of many
genes joined together like beads on a
string.
•Genes are carried from parents to
their offspring on chromosomes.
Works Cited
http://howmanyarethere.net/wp-content/uploads/2011/03/genes.gif
http://theosophical.files.wordpress.com/2010/04/chromosome
http://wps.prenhall.com/esm_krogh_biology_3/17/4438/1136223.cw
/index.html
http://www.babybirthbasics.com/wpcontent/uploads/2010/06/sperm-and-egg.jpg
http://www.biologie.uni-hamburg.de/b-online/library/catremoved/u4aos1p2.html
http://www.medgen.ubc.ca/robinsonlab/mosaic/intro/chromosome.htm
Science textbook-pages126-130