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Mitosis and Meiosis
| question / terms | Answer |
|---|---|
| What is mitosis and what is it used for? | The splitting of cells ; for growth, repair, and development. |
| What is meiosis and what is it used for? | Meiosis is the sexual reproduction of an organism, its used for an organism to reproduce sexually |
| How many phases are in the cell cycle? | There are 4 total phases |
| What happens in G1 and G1 checkpoint? | In G1, proteins and organelles are made, and the cell grows. At the checkpoint, it makes sure the cell is big and healthy enough |
| What are homologous ? | Chromosomes that are the same in shape and size and have the same maternal and paternal chromatids |
| Diploid (2n) | 2 sets of chromosomes |
| Haploid (n) | A single set of chromosomes |
| What happens in the S phase? | DNA is replicated |
| What happens in the G2 checkpoint? | It checks for any mistakes in the DNA |
| What happens in the G2 phase? | it prepares to divide |
| How many phases are in the Mitosis phase? | 4 phases; prophase, metaphase, anaphase, and telophase ( along with cytokinesis but isnt part of it) |
| What happens at the mitosis checkpoint? | It checks to see if the chromosomes have lined up at the equator and is the spindle fibers are attached. |
| What are the two main reasons as to why a cell divides? | Efficiency, and as the cell grows, it places increasing demands on its own DNA |
| What happens in prophase? | The nuclear membrane breaks down, spindle fibers are formed, and the chromatin condenses into chromosomes |
| What happens in metaphase? | The chromosomes line up in the middle and the spindle fibers attach to them |
| What happens in Anaphase? | The chromosomes are pulled apart by the spindle fibers and move on opposite ends of the cell |
| What happens in telophase? | The chromosomes move to opposite ends of the cell and uncoil and two nuclear membranes are formed |
| Cytokinesis | The cytoplasm from the original cell splits, forming the 2 daughter cells |
| How many chromosomes are there after Mitosis? What about Meiosis? | 46 and 23 |
| Sexual reproduction | When 2 organisms sexually reproduce via a sperm and an egg to form another organism that is genetically different from the parents |
| Asexual reproduction | When an organism asexually reproduces via somatic cells (body cells) to form an genetically identical cell |
| What are gametes? | reproductive cells (sperm and an egg) |
| What are germ cells and what are they used for? | Germ cells are cells that are specialized for sexual reproduction; it makes sperm and eggs |
| Autosomes | Chromosomes w/ genes that do not determine the sex of individual |
| Sex chromosomes | Chromosomes that DO have genes that determine the sex of an individual |