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17 Cards in this Set
- Front
- Back
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Cell Cycle
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<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 |
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Cell Theory
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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.
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Centromere
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Constricted portion of each chromosome; location of a kinetochore to which spindle microtubules become attached.
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Chromosomes
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A DNA molecule, with a lot of protiens
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Chromotid
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One of two duplicated DNA molecules attached at centromere. Mitosis or meiosis separtes them
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Diploid
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Presence of two of each type of chromosome in a cell nucleus at interphase.
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Haploid
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Presence of only half of the parental number of chromosomes in a gamete, cause: meiosis
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Homologous pairs
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Alike chromosomes
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Mitosis
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Same chromosome numbers.
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Meiosis
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Halves chromosome number
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Interphase
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2 of each type of chromosome
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Prophase
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when duplicated chromosomes start to condense
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Metaphase
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All pairs become postioned at equator
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Anaphase
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When moved apart to opposite spindle poles
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Telophase
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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 |
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Cytokinesis
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splitting of parent cell to daughter cell
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Binary Fission
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Asexual reproductive mode of phtozoans and other animals. Body divides into two parts of the sme or different zizes.
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