Biology Ch 7 Class 12 Cell Cycle
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Which of the following cells does not enter G0 phase?
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The second stage of the Prophase of Meiosis, following Leptotene, during which homologous chromosomes begin to pair is called:
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Each kinetochore gets ________ fibers in mitosis
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Feature of cancer cells in common?
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A special area of centromere with specific base arrangement and specific proteins where spindle fibers are attached is called
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Reduction division is:
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Chance of a cross over between two loci is directly proportional to their
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How does the second meiotic division differ from mitosis? In the second meiotic division:
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Gametes are produced by:
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During which stage of meiosis do centromeres divide?
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At what phase the DNA content of a cell is doubled?
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In case of neurons, post mitotic cell escapes cell cycle and remain in _______ phase whthout proliferating further
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Process of uncontrolled cell division is due to which one of the following reasons?
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Smooth endoplasmic reticulum is responsible for the metabolism of:
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Mitosis occurs in
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Mitotic apparatus in animals is formed by
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During anaphase, each chromosome has:
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If a person has 44 autosomes + XXY, he will suffer from
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Microtubules are composed of
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Most critical phase of mitosis is
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Crossing over is an exchange of genes between _______ resulting in a mixture of parental characteristics in offspring.
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Which statement is incorrect?
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Which of the following statements concerning nucleolus is correct?
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DNA is synthesized and chromosome number is doubled in
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Condensation of chromosomes reaches to the maximum during:
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Synaptonemal complex helps in:
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Bac
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Synthesis of microtubules increases in:
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Gametes in animals are produced by which of the following?
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Spread of tumor cells and establishment of secondary areas of growth is
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During meiosis, the homologous chromosomes come together and form pairs, this process is called:
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_______ is the stage of mitosis characterized by the physical separation of ________ chromatids.
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During the G2 phase:
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During interphase of the cell cycle, which of the following stage is for duplication of DNA:
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Which of the following statements is true about metaphase?
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Interphase of meiosis lacks
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Exchange of segments between homologous chromosomes is called:
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Reverse of prophase is
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Crossing over occur between ____________ of homologous chromosomes:
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In meiosis II, ______ differentiate into sperms.
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Asexual offsprings can be produced by:
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Which of the following is a type of cell division that plays an important role in evolution?
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Meiosis occurs at the time of
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The term bivalent means:
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During cell division, the spindle fibres get attached to condensing chromosome at a highly differentiated region. This region is called as:
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Which of the following sub stages does not occur in prophase I?
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_______ is the most critical phase of mitosis.
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The phase of mitosis in which sister chromatids move towards opposite poles:
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Gametes in animals are produced by:
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Meiosis occur in
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In plants mitotic apparatus consists of
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Period between two consecutive divisions is called
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In which stage of meiotic division centromere divides?
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Failure of separation of sister chromatids is called:
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From each pair of centrioles ________ sets of microtubules originate
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In gametogenesis, which resultant product is non-functional?
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Which of the following is NOT true for meiosis?
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Interphase is a phase of the cell cycle defined only by the absence of _______.
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During the formation of an ovum nondisjunction of the sex chromosomes occurred the ovum was then fertilized by a normal Y-bearing sperm cell which one of the following shows the sex chromosome complement of the resulting zygote?
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Crossing over takes place during _____ of meiosis.
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Microtubule subunits (for spindle fibers) are synthesized in _______ phase.
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Diplotene is the sub-stage of:
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Which statement is not true about phragmoplast?
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At the beginning of nuclear division, the number of microtubule triplets in two pairs of centrioles that migrate to opposite poles are:
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Which is a feature of malignant tumor?
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Ali Durrani
