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Cell Cycle and Cell Division Test - 15

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Cell Cycle and Cell Division Test - 15
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  • Question 1
    1 / -0
    Choose the correct answers from the alternatives given :
    Meiosis involves:
    Solution
    • Meiosis is the division where the cell after dividing produces 4 daughter cells where the genetic material is halved as compared to the mother cells.
    • Meiosis is divided into meiosis 1 and meiosis 2. In every meiosis the nucleus is divided once.
    • And after the meiosis 1 the nucleus is divided once and the chromosomes are halved during this meiosis.
    • In the meiosis 2 the chromosomes are not divided but the nucleus is divided once
    • This way 4 nucleus are formed after one meiosis and the chromosomes are halved.
    • Meiosis takes place in the formation of gametes where the genetic material is required to be halves for the formation of haploid gametes.
    • Therefore the answer option 'two nuclear divisions with chromosomes dividing only once' is correct.




















  • Question 2
    1 / -0
    In which of the following, the number of chromosomes gets halved? 
    Solution
    • In meiosis, the number of chromosomes gets halved. 
    • In anaphase I of meiosis I, the chromosomes move towards the spindle poles along the path of their tactile fibrils. 
    • The two groups of chromosomes are produced with each group having half the number of chromosomes present in the parent nucleus.
    • In mitosis and amitosis (cell division), the number remains the same.
    • In fertilization, there is a fusion of two cells results in the combining of genetic material in a cell (or formation of zygote).
    So, the correct answer is option C.
  • Question 3
    1 / -0
    The separation of two chromatids of each chromosome at early anaphase is initiated by
    Solution
    • Anaphase is the stage of mitosis after the metaphase when replicated chromosomes are split and the daughter chromatids are moved to opposite poles of the cell. 
    • The separation of two chromatids of each chromosome at early anaphase is initiated by the force of repulsion between the divided kinetochores.
    • Kinetochores are a protein that forms a complex with the centromere of a chromosome during cell division. 

    So, the correct answer is option C.
  • Question 4
    1 / -0
    Which of the following is key event of anaphase of mitotic division?
    Solution
    During the initial stage of mitosis, the centromere splits from the middle and two chromatids get separated out. The chromatid more towards opposite pole due to repulsive forces which are known as anaphasic moments. the anaphasic movements are brought about by the repolymerization of continuous fibres and depolymerization of chromosomal fibres.
    Chromosomes are best studied at anaphase.

    So, the correct option is 'Centromeres split and chromatids separate'
  • Question 5
    1 / -0
    Select the correct option:Mitotic spindle is mainly composed of _____ proteins. 
    Solution
    Spindle fibres are structures formed from microtubles in the cytoplasm during cell division. Microtubules are made up of tubulin protein. Spindle fibres move chromatids or chromosomes diametrically apart and gather then in two clusters at opposite ends (poles) of the cell.
    So, the correct option is 'Tubulin'.
  • Question 6
    1 / -0
    The number of chromosomes is reduced to half during 
    Solution
    Meiosis is the type of cell division by which gamete cells (eggs and sperms) are produced. Meiosis involves two successive nuclear divisions and one cytoplasmic division that produce four haploid cells. The first division (meiosis) is the reductional division during which number of chromosomes is reduced to half. The second division (meiosis II) separates the chromatids. It is called equational division as chromosomes number remains the same as produced after meiosis I.
    So, the correct answer is 'Meiosis I'.
  • Question 7
    1 / -0
    The following process occurs in metaphase
    Solution
    The M phase progresses through well-defined phases. The first stage is prophase followed by metaphase anaphase and finally telophase.
    During metaphase chromosomes are aligned in the centre of a dividing cell.
    so the correct answer is 'chromosomes line up along the equator of the dividing cell'.
  • Question 8
    1 / -0

    If a parent cell has eight chromosomes, then the daughter cells following meiosis will have:
    Solution
    During Meiosis (reductional division) the number of chromosome gets reduced to half after the completion of meiosis.
    So the correct answer is 'four chromosomes'.
  • Question 9
    1 / -0

    In which phase of mitosis are the chromosomes moving toward the poles?
    Solution
    The chromosomes align at the equatorial plane during the metaphase stage in their highly condensed stage. The chromosomes then sperate during the Anaphase stage as they are pulled apart by the spindle apparatus.
    So, the correct option is 'Anaphase'.
  • Question 10
    1 / -0
    Choose the correct answers from the alternatives given :
    In a typical cell cycle, cytokinesis generally overlaps in time with which stage?
    Solution
    • Cytokinesis is the formation of cell after the cell division.
    • The cell division is made up of 4 phases which are prophase, metaphase, anaphase and telophase.
    • The lase phase i.e. the telophase is where the genetic material of the dividing cells is pulled to their respective poles by the spindle fiber and the nuclear membrane starts to reappear.
    • The constriction of the plasma membrane also starts which is the part of the cytokinesis process and this process overlaps with the telophase which is the last one in the cell cycle.
    • as this process overlaps the telophase sometimes in plants or animals also where 2 cells are observed with proper cell wall and nucleus but are still attached to each other as the telophase and the cytokinesis are overlapping each other.
    • Therefore the answer option 'Telophase' is correct.
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