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Bio II
Bio II chapter 12 & 13
| Question | Answer |
|---|---|
| if a cell at metaphase of mitosis contains 20 sister chromatids, how many chromosomes will be present in a G1 cell? | 10 |
| In the cells of many eukaryotic species, the nuclear envelope has to disappear to permit which event in the cell cycle | attachment of microtubules to kinetochores |
| How and at what stage do chromosomes undergo independent assortment? | Meiosis 1 metaphases alignment |
| crossing over begins to occur during | prophase 1 |
| The products of mitosis are __________, while the products of meiosis are __________. | 2 genetically identical diploid daughter cells; 4 genetically different haploid cells |
| Sister chromatid | two copies of the same chromosomes that have the same order of gene along their length and the same exact sequence |
| homologous chromosomes | a pair of chromosomes that have the same order of genes along their length |
| autosomes | all of the chromosomes expect for the x and y chromosome |
| recobinant chromosomes | a chromosome that have had a crossing over event |
| gametes | haploid cells |
| spindle fibers attach to kinetochores during ______ | premetaphase |
| centromeres divide and sister chromatids become full-fledged chromosomes during______ | anaphase |
| chromosomes become visible during _______ | prophase |
| cytokinesis often, but not always, accompanies_______ | telophase |
| nucleoli are present during | interphase |
| During ________ a spindle forms in a haploid cell | prophase 1 |
| At the end of _____ and cytokinesis there are four haploid cells | telophase II |
| During________ chromosomes aligin single file along the equator of a haploid cell | Metaphase II |
| Homologous chromosomes migrate to opposite poles during_____ | anaphase I |
| At the end of_____ and cytokinesis, haploid cells contain chromosomes that each consist of two sister chromatids. | telophase I |
| During________ sister chromatids separate. | anaphase II |
| Meiosis I produce______ cells, each of which is_____ | two; haploids |
| during ______ the cell grows and replicates both its organelles and its chromosomes | interphase |
| During _____ both the contents of the nucleus and the cytoplasm are divided | the mitotic phase |
| Cohesins join sister chromatids of duplicated chromosomes and tubulins assemble into spindle microtubles durinng which phase | Prophase |
| microtubules attach to kinetochores during which phase | premetaphase |
| Kinetochores are motionless in relation to poles of cell in which phase | metaphase |
| in which phase does cohesins break down and kinetochores move towards poles of cells | anaphase |
| in which phase does spindle microtubules disassemble | telophase |
| During prohase, the microtubules pf the mitotic spindles ______ | lengthen |
| During anaphase, the nonkinetochore microtubles _________ and move past each other, and the kinetochore microtubules_______ | lengthen; shorten |
| During telophase, the nonkinetochore microtubules ________ | disassemble |
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