11. Doubling of genetic material in preparation for division occurs in which phase of the celn cycle? a. GO phase b. Gl phase c. G2 phase d. M phase e. S phase
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Oogenesis
The formation of the ovum (mature female gamete) from undifferentiated germ cells is called oogenesis. This process takes place in the ovaries (female gonads). Oogenesis consists of three stages known as the multiplication phase, growth phase, and maturation phase.
Cell Division
Cell division involves the formation of new daughter cells from the parent cells. It is a part of the cell cycle that takes place in both prokaryotic and eukaryotic organisms. Cell division is required for three main reasons:
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- CRITERIA MITOSIS MEIOSIS a. chrosomosomes number of daughter cells b. number of cell divisions c. stages d. Presence of synapses e. presence of crossing over f. cell type that undergoes cell division g. number of daughter cells formed h. DNA content of cells at start of division i. DNA content of daughter cells j. genetic consequencesGive the genetic content © and chromosome number (n) of a diploid cell during the following phases: a. G1 b. S-phase c. G2 d. metaphase e. anaphase f. telophase after cytokinesisWhich of the following is a correct statement during life cycle events in a cell? A. chromatids seperate during S phase B. chromatids seperate during Meiosis II C. chromatids seperate during cytokinesis D. chromatids seperate during Meiosis I
- 1) What phase of mitosis is this? Answer: 2) What is the indicated structure 1? select one. a. chromosome b. chromosome with two sister chromatids c. centrioles/centrosome d. spindle fibres e. metaphase plate 3)If the diploid (2n) number of this cell is 8 how many chromosomes are present? 4) If the diploid (2n) number of this cell is 8 how many sister chromatids are present? 5) If the diploid (2n) number of this cell is 8 how many homologous pairs are present?At metaphase I the kinetochores of sister chromatids are a. attached to microtubules from the same pole. b. attached to microtubules from opposite poles. c. held together with cohesin proteins. d. not attached to any microtubules.What celluar events/processes are associated with G1,S,G2,and M phases of the cell cycle? With the phases of mitosis? Some example: A. DNA replication B. Beginning of mitosis C. Normal cell growth and function D. Breaksdown of nuclear membrane E.Separation of sister chromatids F.Alignment of chromosomes on the equator of the cell H.Triggering the compaction and condensation of chromosomes I. Attachment of microtubles to kinetochores
- Match the following events with the stages in mitosis: chromosomal materials condenses to form compact chromosomes. alignment of chromosomes along the equator or plate with microtubules attached to poles sister chromatids for each chromosome split and move to opposite poles chromosomes are clustered at each of the poles and give way to cytokinesis A. telophase B. anaphase C. metaphase D. prophasewhich of the following events occurs during anaphase B in a mitotic cell a. lengthening of the overlap microtubules b. Shortening of the overlap microtubules c. Shortening of the overlap microtublues d. Shortening of the astral microtubules e. Lengthening of the kinetochore microtubulesThe primary function of Asters in mitosis is Select one: O a. The production of microfilaments spindles to separate the two sister chromatids O b. The formation of microfilaments needed to hold chromosomes O C. The formation of microtubule spindles to separate the daughter chromosomes O d. The dissociation of the nuclear envelop O e. Formation of a cleavage furrow
- Which of the following statements is FALSE? A. Centrosomes are anchor points for microtubules and are essential to form the mitotic spindle. B. In the eukaryotic cell cycle the cell spends much more time in the interphase than in the mitotic phase. C. In telophase two nuclear envelopes are fully formed and the cell splits in two via cytokinesis. D. The contraction of the kinetochore microtubules leads to the separation of the sister chromatids during anaphase. E. In the prophase chromatin condenses into X-shaped chromosomes.Which of these is paired incorrectly?a. prometaphase—the kinetochores become attached tospindle fibersb. anaphase—daughter chromosomes migrate toward spindlepolesc. prophase—the nucleolus disappears and the nuclearenvelope disintegratesd. metaphase—the chromosomes are aligned in the metaphaseplatee. telophase—a resting phase between cell division cyclesThe diagram below shows a model for the normal regulation of the transition to anaphase during mitosis. 1. Signals are released by unattached kinetochores that cause MAD to bind CDC20. MAD CDC20 6. Chromatids separate as mitosis procoeds to anaphase. COHESIN 3. The APCCDC20 CDC20 complex ubiquinates Securin. APC 2. When all kinetochores are attached, MAD releases CDC20 which then combines with APC UBIQUITIN SEPARASE . Separase destroys Cohesin APC SEPARASE SECURIN 4. Securin is destroyed, releasing Separase Your analyses of cancer cells that do not regulate this transition normally indicate that: MAD is binding to CDC20; • Ubiquitin is not attached to securin; • Sister chromatids separate and move to opposite poles of the cell. Which of the following explanations could account for all of your observations? a. The cell has an alteration in MAD that prevents it from releasing CDC20 when the 'unattached kinetochore' signal stops. O b. More than one of the other answer choices are correct.…