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17 Cards in this Set

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Cell Cycle
<b>G1(growth 1)</b>: Period of cell growth before the DNA is duplicated
<b>S</b>:Period when the DNA is duplicated(chromosomes are duplicated)
<b>G2</b>:Period after DNA is duplicated; cell prepares for division
<b>Mitosis</b>: nuclear division only, usually followed by cytoplasmic division
Cell Theory
First, every organism is composed of one or more cells. Second, the cell is the smallest unit having the properties of life. Third, the continuity of life arises directly from the growth and division of single cells.
Centromere
Constricted portion of each chromosome; location of a kinetochore to which spindle microtubules become attached.
Chromosomes
A DNA molecule, with a lot of protiens
Chromotid
One of two duplicated DNA molecules attached at centromere. Mitosis or meiosis separtes them
Diploid
Presence of two of each type of chromosome in a cell nucleus at interphase.
Haploid
Presence of only half of the parental number of chromosomes in a gamete, cause: meiosis
Homologous pairs
Alike chromosomes
Mitosis
Same chromosome numbers.
Meiosis
Halves chromosome number
Interphase
2 of each type of chromosome
Prophase
when duplicated chromosomes start to condense
Metaphase
All pairs become postioned at equator
Anaphase
When moved apart to opposite spindle poles
Telophase
Meiosis 1: One member of each pair of homologous chromosomes has arrived at a spindle pole.
Meiosis 2: Stage when chromosomes decondense into threadlike structures and two daughter nuclei form
Cytokinesis
splitting of parent cell to daughter cell
Binary Fission
Asexual reproductive mode of phtozoans and other animals. Body divides into two parts of the sme or different zizes.