AP Biology Mitosis and Meiosis Flashcards
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| 6895236724 | two | How many daughter cells are produced in mitosis? | 0 | |
| 6895236725 | genome | -consists of all the DNA in a cell -holds specific genetic traits | 1 | |
| 6895236726 | chromosomes | -packages in a cell which contain DNA molecules -humans have 46 -each species has a specific number |  | 2 |
| 6895236727 | chromatin | -makes up chromosomes -complex of DNA and protein |  | 3 |
| 6895236728 | somatic cells | -have two sets of chromosomes -go through mitosis -nonreproductive | 4 | |
| 6895236729 | gametes | -have half as many chromosomes as somatic cells -go through meiosis -reproductive cells | 5 | |
| 6895236730 | sister chromatids | -each duplicated chromosome has two -separate during cell division |  | 6 |
| 6895236731 | centromere | -narrow waist of the duplicated chromosome -where the two chromatids are most closely attached |  | 7 |
| 6895236732 | cytokinesis | -division of the cytoplasm | 8 | |
| 6895236733 | interphase | -where 90% of a cell's life is spent -cell growing and chromosomes coping -3 subphases: -G1 -Synthesis -G2 -cell is growing | 9 | |
| 6895236734 | G2 | In which subphase of interphase are the chromosomes duplicated? | 10 | |
| 6895236735 | prophase | -first stage of mitosis -spindle fibers start to forms -nucleus thins -sister chromatids combine to make chromosomes |  | 11 |
| 6895236736 | prometaphase | -second stage of mitosis -the nuclear envelope fragments -the spindle microtubules attach to the kinetochores of the chromosomes |  | 12 |
| 6895236737 | metaphase | -third phase of mitosis -chromosomes line up in the center of the cell -spindle fibers attach to the kinetochores of each sister chromatid |  | 13 |
| 6895236738 | anaphase | -fourth phase of mitosis -sister chromatids separate and move toward opposite ends of the cell |  | 14 |
| 6895236739 | telophase | -fifth and final stage of mitosis -genetically identical daughter nuclei form at opposite ends of the cell -nonkinetochore microtubules from opposite poles overlap and push each other elongating the cell |  | 15 |
| 6895236740 | mitotic spindle | -apparatus of microtubules that control chromosome movement during mitosis |  | 16 |
| 6895236741 | centrosome | -microtubule organizing center -replicates, each set goes to opposite ends -spindle fibers grow out from them |  | 17 |
| 6895236742 | kinetochores | -protein complexes that assemble on sections of DNA at centromeres -where spindle fibers and microtubules attach |  | 18 |
| 6895236743 | metaphase plate | -midway point between the spindles two poles -where chromosomes line up in metaphase |  | 19 |
| 6895236744 | cleavage furrow | -formed during late telophase and cytokinesis |  | 20 |
| 6895236745 | cell plate | forms in plant cells during cytokinesis |  | 21 |
| 6895236746 | binary fission | -prokaryotic method of reproduction and cell division -chromosome replicates and the two daughter chromosomes actively more apart |  | 22 |
| 6895236747 | cell cycle control system | -directs sequential event of the cell cycle -regulated by internal and external force -receives signals from the cytoplasm |  | 23 |
| 6895236748 | checkpoints | -where the cell cycle stops until a go ahead signal is received -G1 is the most important for many cells |  | 24 |
| 6895236749 | G0 | -the nondividing stage of the cell if it does not pass the G1 checkpoint | 25 | |
| 6895236750 | growth factors | proteins released by certain cells that stimulate other cells to divide | 26 | |
| 6895236751 | density dependent inhibition | crowded cells stop dividing | 27 | |
| 6895236752 | cancer cells | -cells that exhibit neither density dependent inhibition nor anchorage dependence -escape the usual control system -do not need growth factors to divide | 28 | |
| 6895236753 | tumors | -masses of abnormal cells within otherwise normal tissue -formed by cancer cells | 29 | |
| 6895236754 | benign tumor | -lump of abnormal cells remaining only at the original site of the cancer | 30 | |
| 6895236755 | malignant tumor | invade surrounding tissue | 31 | |
| 6895236756 | metastasize | exporting cancer cells to other parts of the body, where they may form secondary tumors | 32 | |
| 6895236757 | 46 | What is the chromosome number for humans? | 33 | |
| 6895236758 | homologous chromosomes | -2 chromosomes in each pair -same length and shape -carry genes controlling the same inherited characters |  | 34 |
| 6895236759 | diploid cell | -has two sets of chromosomes -human # is 46 -2n |  | 35 |
| 6895236760 | haploid | -gamete -contains a single set of chromosomes -n | 36 | |
| 6895236761 | fertilization | the union of gametes (sperm and egg) | 37 | |
| 6895236762 | zygote | -fertilized egg -one set of chromosomes from each parent -diploid cell produces somatic cells by mitosis | 38 | |
| 6895236763 | prophase I | -occupies more than 90% of the time required for meiosis -chromosomes condense -synapse and crossing over -tetrads and chiasmata | 39 | |
| 6895236764 | synapsis | -homologous chromosomes loosely pair up -align gene by gene -get together with homologous pair | 40 | |
| 6895236765 | crossing over | nonsister chromatids exchange DNA segments |  | 41 |
| 6895236766 | metaphase I | homologous pairs line up in the middles of the cell and the spindle fibers attach to them |  | 42 |
| 6895236767 | anaphase I | -chromosomes move toward each pole -sister chromatids move as one unit toward the pole |  | 43 |
| 6895236768 | telophase I | -beginning: each half of the cell has a haploid set of chromosomes -each chromosome consists of two sister chromatids |  | 44 |
| 6895236769 | prophase II | spindle apparatus forms |  | 45 |
| 6895236770 | metaphase II | -because of crossing over the sister chromatids are no longer genetically identical -kinetochores of sister chromosomes attach to microtubules extending from opposite poles |  | 46 |
| 6895236771 | anaphase II | -sister chromatids of each chromosome move as two newly individual chromosomes toward opposite poles |  | 47 |
| 6895236772 | telophase II | -chromosomes arrive at opposite poles -nuclei form and the chromosomes begin decondensing |  | 48 |
| 6895236773 | independent assortment of chromosomes | -mechanism contributing to genetic variation -homologous pairs of chromosomes orient randomly -metaphase I -each pair of chromosomes sorts maternal and paternal homologs into daughter cells independently of the other pairs -the number of combinations possible when chromosomes assort independently into gametes is 2^n where n is the haploid number |  | 49 |
| 6895236774 | crossing over | -mechanism contributing to genetic variation -produces recombinant chromosomes -begins in early prophase I -homologous chromosomes pair up gene by gene -homologue portions of two nonsister chromatids trade places -combines DNA from two parents into a single chromosome |  | 50 |
| 6895236775 | random fertilization | -any sperm can fuse with any ovum -the fusion of two gametes produces a zygote with any of about 70 trillion diploid combinations -each zygote has a unique genetic identity |  | 51 |