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Chapter 4
Cell division
25
Science
7th Grade
12/11/2012

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Term
Mitosis
Definition
The Division of the cell nucleus into 2 individual nuclei.Each has the same number of chromosones as the parent cell
Term
Semi-permiable
Definition
Allowing only certin substances to pass threw.
Term
Chromasome
Definition
Clumps of DNA formed durring mitosis found in the nucleus. they contain hereditairy material.
Term
Cell division
Definition
When a cell divides to produce 2 new cells.
Term
Centrioles
Definition
Smallstructures that anchor spindle fibers durring mitosis.
Term
Interphase
Definition
the active stage between cell division.
Term
Prophase
Definition
DNA formes into strands of called cromasomes.
Term
Metaphase
Definition
chromasomes line up in the center on spindle fibers.
Term
Anaphase
Definition
double chromasomes split and are pulled away from each other.
Term
Telophase
Definition
Chromasomes reach centrioles spindle fibers disapear and a new nucleus forms.
Term
Asexual
Reproduction
Definition
When a new organism is formed from one organism.
Term
Sexual
Reproduction
Definition
When a new organisim is formed by 2 parent organisims.
Term
Sperm
Definition
A male sex cell containing 1/2 the parents chromasome.
Term
Egg
Definition
A female sex cell containing 1/2 the arents chromasomes.
Term
Fertilization
Definition
The joining of an egg and a sperm cell.
Term
Zygote
Definition
A new dipliod cell formed by 2 hapliod cells. Zygote divides mitosis.
Term
Diploid
Definition
when cells have pairs of similar chromasomes.
Term
Haploid
Definition
When cells do not have similar chromasomes.
Term
Meosis
Definition
When a diploid cell produces a haploid cell.
Term
DNA
Definition
Ginetic material making up all organisms. made of 2 twisted strands.
Term
RNA
Definition
CArrys cdes to the nucleus to make protiens for the ribisomes.
Term
Gene
Definition
A section of DNA on a chromasome that contains instructions for making protiens.
Term
Mutation
Definition
A perminent change in a gene or chromasome.
Term
Fermentation
Definition
Glucos breaks downinto alchohal or acid.
Term
Respiration
Definition
Cell braeks down glucos completly to make corbon dioxide water and energy (requiers oxygen).
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