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Biology: Life On Earth Ch. 11
Vocab for Ch. 11: The Continuity of Life: Cellular Reproduction
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10/19/2005

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Term
allele
Definition
Alternate forms of a given gene that may produce differences in structure or function.
Term
anaphase
Definition
The phase in which sister chromatids separate and are pulled to opposite poles of the cell.
Term
asexual reproduction
Definition
A form of reproduction in which offspring are formed from a single parent, rather than through the union of gametes from two parents.
Term
autosome
Definition
Chromosomes which have similar appearance, similar genetic composition, and are paired in diploid cells of both sexes.
Term
binary fission
Definition
Cell division in prokaryotic cells
Term
cell cycle
Definition
The sequence of activities that occurs from one cell division to the next.
Term
cell division
Definition
The process in which one copy of each chromosome and usually about half the cytoplasm are parceled out into each of the two daughter cells.
Term
cell plate
Definition
A structure shaped like a flattened sac, surrounded by plasma membrane and filled with sticky carbohydrates. This occurs only in plant cells.
Term
centrioles
Definition
Objects containing microtubules which will eventually pinch the cell membrane.
Term
centromere
Definition
The point where two DNA double helices attach.
Term
chiasma (chiasmata)
Definition
Crosses where the maternal and paternal chromosomes intertwine.
Term
chromatid
Definition
An attached chromosome
Term
clone
Definition
Individual organisms that are genetically identical toa preexisting individual.
Term
cloning
Definition
The creation of one or more individual organisms (clones) that are genetically indentical to a preexisting individual.
Term
crossing over
Definition
The exchange of DNA between maternal and paternal chromosomes at chiasmata.
Term
cytokinesis
Definition
Cytoplasmic division
Term
differentiation
Definition
When generic cells begin to become specialized to a certain task.
Term
diploid
Definition
A word used to describe cells with homologous chromosomes.
Term
duplicated chromosome
Definition
A chromosome with two identical sister chromatids
Term
gametes
Definition
eggs or sperm
Term
haploid
Definition
The name for cells that contain only one of each type of chromosome.
Term
homologue
Definition
Chromosomes that contain the same genes.
Term
interphase
Definition
The process during which the cell acquires nutrients from its environment, grows, and duplicates its chromosomes.
Term
karyotype
Definition
An entire set of stained chromosomes form a single cell.
Term
kinetochore
Definition
A protein-containing structure that serves as an attachment site for the ends of spindle microtubules.
Term
locus
Definition
A specific place on a specific chromosome.
Term
meiosis
Definition
The process involving two rounds of cytokinesis to produce four daughter cells that can become gametes.
Term
meiotic cell division
Definition
A proces that occurs in ovaries and testes and involves meiosis.
Term
metaphase
Definition
The phase in which the Chromosomes align along the equator of the Cell.
Term
mitosis
Definition
Nuclear division.
Term
mitotic cell division
Definition
The process which consists of nuclear division followed by cytoplasmic division.
Term
prophase
Definition
The phase in which the chromosomes condense and the spindle microtubules form and attach to the chromosomes.
Term
recombination
Definition
the formulation of new combinations of allelss on a chromosome.
Term
sex chromosome
Definition
Either an X or Y chromosome.
Term
sexual reproduction
Definition
The process involving the fusion of the gamete from each parent forming a genetically unique offspring.
Term
spindle microtubules
Definition
They originate from the centrioles and pinch the cell membrane.
Term
telomeres
Definition
The "endcaps" of chromosomes.
Term
telophase
Definition
The phase in which Nuclear envelopes form around both groups of chromosomes.
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