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Mitosis Notes
7th Grade, Mitosis notes
Definiton | Term |
---|---|
Takes place/occurs in human body (somatic) cells; (these are every cell except the egg or sperm). | Mitosis |
Chromosomes multiply and divide when the cell reproduces, producing cells that are identical to parent cell cause there's no genetic information being exchanged or rearranged. | Asexual reproduction |
What happens when mutation occurs? | There will be a different or wrong cell being produced. |
Uncoiled strands of DNA | Chromatin |
coiled chromatin; contains genes | Chromosomes |
Segments of DNA on a chromosome that codes for a certain hereditary trait | Genes |
One part of a duplicated chromosome | Chromatid |
2 chromatids are attached by what? | Centromere |
Specialized DNA sequence of a chromosome that links with a pair of chromatids. | Centromere |
Chromosome pairs that are structurally similar and contain information for same genes; ( can have different expression of information on those genes) | Homologous pairs |
Each body cell has how many chromosomes? | 46 chromosomes |
Contain all homologous pairs of chromosomes. | Diploid Cells |
Chromosomes (in the form of chromatin) and organelles replicate. | Interphase |
-Chromatin coils into chromosomes (hint: each chromosome now is made of 2 chromatids joined by a centromere) -nuclear membrane disappears -Spindle fibers form | Prophase |
Chromosomes move to the center of the cell( the equator) | Metaphase |
-Chromosomes divide and chromatids separate -Chromatids are pulled to opposite sides pulled by spindle fibers | Anaphase |
-Centrioles and spindle fibers disappear -Chromatids unwind back into chromatin -Nuclear membrane reforms -Cytoplasm starts to divide into 2 cells | Telophase |
-Cytoplasm in parent cell divides -there are now 2 daughter cells that have DNA identical to the parent cell | Cytokinesis |
Is Cell division a continuous cycle? | Yes |