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Vocabulary wordds
pages 154 & 161
22
Biology
9th Grade
05/13/2011

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Term
binary fission
Definition
a form of asexual reproduction in single-celled organisms by which one cell divides into two cells of the same size
Term
mitosis
Definition
in eukaryotic cells, a process of cell division that forms two new nuclei, each of which has the same number of chromosomes
Term
asexual reproduction
Definition
reproduction that does not involve the union of gametes and in which a single parent produces offspring that are genetically identical to the parent
Term
meiosis
Definition
a process in cell division during which the number of chromosomes decreases to half the original number by two divisions of the nucleus, which results in the production of sex cells (gametes or spores)
Term
gamete
Definition
a haploid reproductive cell that unites with another haploid reproductive cell to form a zygote
Term
interphase
Definition
a period between two mitotic or meiotic divisions during which the cell grows, copies its DNA, and synthesizes proteins
Term
cytokinesis
Definition
the division of the cytoplasma of a cell; cytokinesis follows the division of the cell's nucleus by mitosis or meiosis
Term
prophase
Definition
the first stage of mitosis and meiosis in cell division; characterized by the condensation of the chromosomes
Term
spindle fiber
Definition
one of the microtubules that extend across a dividing eukaryotic cell; assists in the movement of chromosomes
Term
metaphase
Definition
one of the stages of mitosis and meiosis, during which all of the chromosomes move to the cell's equator
Term
anaphase
Definition
a phase of mitosis and meiosis in which the chromosomes separate
Term
telophase
Definition
the final stage of mitosis or meiosis, during which a nuclear membrane forms around each set of new chromosomes
Term
cell plate
Definition
the precursor of a new plant cell wall that forms during cell division and divides a cell into two
Term
synapsis
Definition
the pairing of homologous chromosomes during meiosis
Term
tetrad
Definition
the four chromatids in a pair of homologous chromosomes that come together as a result of synapsis during meiosis
Term
crossing-over
Definition
the exchange of genetic material between homologous chromosomes during meiosis; can result in genetic recombination
Term
genetic recombination
Definition
the regrouping of genes in an offspring that results in a genetic makeup that is different from that of the parents
Term
independent assortment
Definition
the random distribution of the pairs of genes on different chromosomes to the gametes
Term
spermatogenesis
Definition
the process by which male gametes form
Term
oogenesis
Definition
the production, growth, and maturation of an egg, or ovum
Term
polar body
Definition
the other three products of meiosis ?
Term
sexual reproduction
Definition
reproduction in which gametes from two parents unite
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