click below
click below
Normal Size Small Size show me how
ch. 10 & 11 pt.2
Cell growth and division
Term | Definition |
---|---|
prophase | chromosomes coil up and become visible, nuclear envelope dissolves, a spindle forms, centrioles begin to move to opposite sides of the cell |
spindle | what holds the chromosomes at their centromeres and pulls them during cell division |
metaphase | chromosomes moves to the center and line up along the equator. spindle fibers link to the chromosomes at their centromeres |
anaphase | centromeres divide. the two chromatids move toward the opposite pole as the spindle fibers shorten |
telophase | nuclear envelope forms around the chromosomes. chromosomes uncoil and the spindle disappears. |
homologous(pairs) | chromosomes found in even numbers-matched sets- |
meiosis | the process by which cells divide with the chromosome number reduced by half |
tetrad | when pairs of homologous chromosomes join together |
crossing over | portions of one chromosome are broken and exchanged with the corresponding part of the other chromosome |
nondisjunction | the failure of homologous chromosomes or sister chromatids to separate properly during cell division |
gamete | haploid reproductive cells |
asexual reproduction | binary fission- produces identical offspring in prokaryotic cells |