| 6247410980 | two | How many daughter cells are produced in mitosis? | | 0 |
| 6247410981 | genome | -consists of all the DNA in a cell
-holds specific genetic traits | | 1 |
| 6247410982 | chromosomes | -packages in a cell which contain DNA molecules
-humans have 46
-each species has a specific number |  | 2 |
| 6247410983 | chromatin | -makes up chromosomes
-complex of DNA and protein |  | 3 |
| 6247410984 | somatic cells | -have two sets of chromosomes
-go through mitosis
-nonreproductive | | 4 |
| 6247410985 | gametes | -have half as many chromosomes as somatic cells
-go through meiosis
-reproductive cells | | 5 |
| 6247410986 | sister chromatids | -each duplicated chromosome has two
-separate during cell division |  | 6 |
| 6247410987 | centromere | -narrow waist of the duplicated chromosome
-where the two chromatids are most closely attached |  | 7 |
| 6247410988 | cytokinesis | -division of the cytoplasm | | 8 |
| 6247410989 | interphase | -where 90% of a cell's life is spent
-cell growing and chromosomes coping
-3 subphases:
-G1
-Synthesis
-G2
-cell is growing | | 9 |
| 6247410990 | G2 | In which subphase of interphase are the chromosomes duplicated? | | 10 |
| 6247410991 | prophase | -first stage of mitosis
-spindle fibers start to forms
-nucleus thins
-sister chromatids combine to make chromosomes |  | 11 |
| 6247410992 | prometaphase | -second stage of mitosis
-the nuclear envelope fragments
-the spindle microtubules attach to the kinetochores of the chromosomes |  | 12 |
| 6247410993 | 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 |
| 6247410994 | anaphase | -fourth phase of mitosis
-sister chromatids separate and move toward opposite ends of the cell |  | 14 |
| 6247410995 | 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 |
| 6247410996 | mitotic spindle | -apparatus of microtubules that control chromosome movement during mitosis |  | 16 |
| 6247410997 | centrosome | -microtubule organizing center
-replicates, each set goes to opposite ends
-spindle fibers grow out from them |  | 17 |
| 6247410998 | kinetochores | -protein complexes that assemble on sections of DNA at centromeres
-where spindle fibers and microtubules attach |  | 18 |
| 6247410999 | metaphase plate | -midway point between the spindles two poles
-where chromosomes line up in metaphase |  | 19 |
| 6247411000 | cleavage furrow | -formed during late telophase and cytokinesis |  | 20 |
| 6247411001 | cell plate | forms in plant cells during cytokinesis |  | 21 |
| 6247411002 | binary fission | -prokaryotic method of reproduction and cell division
-chromosome replicates and the two daughter chromosomes actively more apart |  | 22 |
| 6247411003 | cell cycle control system | -directs sequential event of the cell cycle
-regulated by internal and external force
-receives signals from the cytoplasm |  | 23 |
| 6247411004 | checkpoints | -where the cell cycle stops until a go ahead signal is received
-G1 is the most important for many cells |  | 24 |
| 6247411005 | G0 | -the nondividing stage of the cell if it does not pass the G1 checkpoint | | 25 |
| 6247411006 | growth factors | proteins released by certain cells that stimulate other cells to divide | | 26 |
| 6247411007 | density dependent inhibition | crowded cells stop dividing | | 27 |
| 6247411008 | 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 |
| 6247411009 | tumors | -masses of abnormal cells within otherwise normal tissue
-formed by cancer cells | | 29 |
| 6247411010 | benign tumor | -lump of abnormal cells remaining only at the original site of the cancer | | 30 |
| 6247411011 | malignant tumor | invade surrounding tissue | | 31 |
| 6247411012 | metastasize | exporting cancer cells to other parts of the body, where they may form secondary tumors | | 32 |
| 6247411013 | 46 | What is the chromosome number for humans? | | 33 |
| 6247411014 | homologous chromosomes | -2 chromosomes in each pair
-same length and shape
-carry genes controlling the same inherited characters |  | 34 |
| 6247411015 | diploid cell | -has two sets of chromosomes
-human # is 46
-2n |  | 35 |
| 6247411016 | haploid | -gamete
-contains a single set of chromosomes
-n | | 36 |
| 6247411017 | fertilization | the union of gametes (sperm and egg) | | 37 |
| 6247411018 | zygote | -fertilized egg
-one set of chromosomes from each parent
-diploid cell
produces somatic cells by mitosis | | 38 |
| 6247411019 | prophase I | -occupies more than 90% of the time required for meiosis
-chromosomes condense
-synapse and crossing over
-tetrads and chiasmata | | 39 |
| 6247411020 | synapsis | -homologous chromosomes loosely pair up
-align gene by gene
-get together with homologous pair | | 40 |
| 6247411021 | crossing over | nonsister chromatids exchange DNA segments |  | 41 |
| 6247411022 | metaphase I | homologous pairs line up in the middles of the cell and the spindle fibers attach to them |  | 42 |
| 6247411023 | anaphase I | -chromosomes move toward each pole
-sister chromatids move as one unit toward the pole |  | 43 |
| 6247411024 | telophase I | -beginning: each half of the cell has a haploid set of chromosomes
-each chromosome consists of two sister chromatids |  | 44 |
| 6247411025 | prophase II | spindle apparatus forms |  | 45 |
| 6247411026 | 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 |
| 6247411027 | anaphase II | -sister chromatids of each chromosome move as two newly individual chromosomes toward opposite poles |  | 47 |
| 6247411028 | telophase II | -chromosomes arrive at opposite poles
-nuclei form and the chromosomes begin decondensing |  | 48 |
| 6247411029 | 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 |
| 6247411030 | 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 |
| 6247411031 | 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 |