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Exploring life chapter 9.1-9.3
Flashcards for vocab
33
Biology
9th Grade
10/25/2010

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Term
asexual reproduction
Definition
When a cell or group of cells each duplicates its genetic material and then splits into two new genetically identical cells. This process only requires one parent.
Term
sexual reproduction
Definition
In sexual reproduction genetic material from each of two parents combines, producing offspring that differ genetically from either parent.
Term
chromatin
Definition
Very long fibers that are too thin to be seen under a light microscope, a combination of DNA and protein molecules
Term
chromosomes
Definition
As a cell prepares to divide, its chromatin fibers condense, becoming visible as the compact structures called chromosomes.
Term
sister chromatids
Definition
Each chromosome consists of two identical joined copies, known as sister chromatids.
(Does not imply female gender)
Term
centrometer
Definition
The region where the two chromatids are joined tightly together.
Term
cell cycle
Definition
The cell cycle extends from the "birth" of the cell as a result of cell reproduction to the time the cell itself reproduces.
Term
Interphase
Definition
The stage during which a cell carries out its metabolic processes and performs its functions.
Term
Mitotic phase ( M Phase )
Definition
The mitotic phase consists of two processes, mitosis and cytokineses.
Term
Mitosis
Definition
When the nucleus and the duplicated chromosomes divide and are evenly distributed, forming two "daughter" nuclei. ( DOES NOT IMPLY GENDER )
Term
Cytokinesis
Definition
The process by which the cytoplasm is divided in two. Generally begins before mitosis is completed.
Term
spindle
Definition
The chromosomes' movements guided by a football-shaped framework of microtubles.
Term
centrosomes
Definition
region of cytoplasmic material that in animal cells contains structures called centrioles.
Term
Name and order the 4 stages in mitosis.
Definition
Prophase, metaphase, anaphase, telophase.
Term
Prophase
Definition
The first stage of mitosis.
Term
Metaphase
Definition
The second stage of mitosis.
Term
Anaphase
Definition
The third stage of mitosis.
Term
Telophase
Definition
The fourth and final stage of mitosis.
Term
cell plate
Definition
A disk containing cell wall material
Term
benign tumor
Definition
An abnormal mass of essentially normal cells
Term
malignant tumors
Definition
masses of cells that result from the reproduction of cancer cells
Term
Cancer
Definition
A disease caused by the severe disruption of the mechanisms that normally control the cell cycle
Term
metastasis
Definition
The spread of cancer beyond their original site
Term
meiosis
Definition
A type of cell division that produces four cells, each with half the number of chromosomes as the parent cell.
Term
karyotype
Definition
A display of the 46 chromosomes of an individual
Term
homologous chromosomes
Definition
The two chromosomes of each matching pair
Term
sex chromosomes
Definition
The 23rd pair of chromosomes that determines gender.
Term
Diploid
Definition
Containing two homologous sets of chromosomes.
Term
gametes
Definition
Egg and sperm cells, also known as sex cells.
Term
haploid
Definition
A cell with a single set of chromosomes.
Term
fertilization
Definition
The nucleus of a haploid sperm cell from the father fuses with the nucleus of the haploid egg cell from the mother.
Term
zygote
Definition
The fertilized eggs resulting from fertilization.
Term
tetrads
Definition
The paired chromosomes consisting of four chromatids resulting from prophase I.
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