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Mitosis/Meiosis Test
Science Test on 5/23/12 on Process of Mitosis and Meiosis
Question | Answer |
---|---|
Fertilization | The union of egg and sperm cell. Results in a zygote |
Zygote | The first cell with a full set of chromosomes. |
Gamete | Another name for a sex cell, egg or sperm cell. |
Diploid | The full set of chromosomes: 23 pairs/46 chromosomes for humans |
Haploid | Half set of chromosomes: 23 single chromosomes for humans |
Crossing Over | Process by which some DNA is swapped between matching chromosomes during meiosis. Helps ensure that all sex cells are unique. |
Polar Bodies | Three of the four egg cells produced by meiosis. Body will absorb them. |
Ovaries | Female reproductive organ. Where meiosis takes place. Where egg cells are produced. |
Testes | Male reproductive organ. Where meiosis takes place. Where sperm cells are produced. |
Interphase | -During most of this the cell is growing -Chromosomes are copied (DNA replication) -Chromatin turns into Chromosomes |
Prophase | -Mitosis begins -centrioles move to opposite ends of the cell -nuclear membrane breaks down -nucleolus disappears/disintegrates -chromosomes are visible -meshlike spindle fibers form |
Metaphase | -chromosomes line up in the middle -chromosomes and centrioles are attached to spindle fibers |
Anaphase | -cell elongates -centromere splits -sister chromatids are puled to opposite sides by the spindle fibers |
Telophase | -chromosomes uncoil (become chromatin) -nuclear membrane forms again -nucleolus reappears -spindle disappears -mitosis ends |
Cytokinesis | Animal cells: cytoplasm divides and "pinches off" Plant cells: new cell wall forms instead and slowly divides the cell |
Mitosis | The process by which the nucleus of a cell divides into two nuclei and the formation of two new daughter cells begins. (these daughter cells are body cells) |
Chromosome | Threadlike strands of DNA and protein in a cell nucleus that carry the code for the cell characteristics of an organism |
Gene | The segment of DNA on a chromosome that directs the making of a specific protein, thus controlling traits that are passed to offspring. |
Guanine | Nitrogen base. Only pairs with cytosine. |
Cytosine | Nitrogen base. Only pairs with guanine. |
Thymine | Nitrogen base. Only pairs with adenine. |
Adenine | Nitrogen base. Only pairs with thymine. |
Meiosis | The process that produces the sex cells, sperm and egg cells. |
Double helix | twisted ladder, spiral staircase |
Deoxyribose | Sugar on the side of a DNA strand. |
DNA | Deoxyribonucleic Acid |
Watson and Crick | The two scientists who made models of DNA in order to discover its structure. |
Sperm | Male sex cell. Combines with egg cell to create zygote. Very small and has a whiplike tail and its head is almost all nucleus. Moves on its own and millions are produced. |
Egg | Female sex cell. Much bigger than sperm. Provides nourishment. Spherical shape and one is produced per month. |
Phosphate | Makes up sides of DNA strands. |
Sex cell | Reproductive cells, either sperm or egg. |
Chromatin | Threadlike coils, genetic material and it's present in the nucleus during interphase. |
Parent Cell | Original cell that goes through meiosis or mitosis. In humans has to start with 46 chromosomes. |
Daughter Cell | Copied cell that came from parent cell. After meiosis there are 4 of them. After mitosis there are 2 of them. |
Centromere | A structure that holds together two identical chromosomes to each other. |
Centrioles | Attach to spindle on each side of the cell and pull apart chromosomes during anaphase and telophase. |
Body Cell | Has 46 chromosomes and is produced by mitosis. |
Protein | The nutrients made up of amino acids and used for growth and cell repair. |
Sister Chromatids | A sister chromosome during interphase. When 2 identical chromosomes are attached at centromere. |
Nitrogen Base | Makes up the steps of the DNA strand. Adenine, thymine, cytosine, and guanine. |
Nucleotide | Nucleic acid such such as DNA are made up of chains and they are the building blocks of DNA. |
Sexual Reproduction | Sperm and egg combine, has two parents, doesn't have DNA identical to parents |
Asexual Reproduction | New organisms are produced by one parent, offspring has identical DNA, an example is mitosis. |