Spindle fibres attach on to 

(a) Kinetochore of the chromosome
(b) centromere of the chromosome
(c) Kinetosome of the chromosome
(d) telomere of the chormosome 

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In meiosis crossing over is initiated at 

(a) leptotene
(b) Zygotene
(c) diplotene
(d) pachytene

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Arrange the following events of meiosis in correct sequences

I. Crossing Over

II. Synapsis

III. terminalisation of chaismata

IV. Disapperance of nucleolus

(1) II, I, IV, III

(2) II, I, III, IV

(3) I, II, III, IV

(4) II, III, IV, I

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The chromosomes in which centromere is situated close to one end are

(a) metacentric                (b) acrocentric

(c) telocentric                  (d) sub-metacentric

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A somatic cell that has just completed the S-phase of its cell cycle, as compared to gamete of the same species has

(a) twice the number of chromosomes and twice the amount of DNA
(b) same number of chromosomes but twice the amount of DNA
(c) twice the number of chromosomes and four times the amount of DNA
(d) four times the number of chromosomes andtwice the amount of DNA

 

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During which phase(s) of cell cycle, amount of DNA in a cell remains at 4C level if the inital amount is denoted as 2C?
(a) G0 and G1
(b) G1 and S
(c) Only G2
(d) G2 abd M

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In S-phase of the cell cycle 

(a) amount of DNA doubles in each cell

(b) amount of DNA remains same in each cell

(c) chromosome number is increased

(d) amount of DNA is reduced to half in each cell

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The enzyme recombinase is required at which stage of meiosis?
(a) Pachytene
(b) Zygotene
(c) Diptotene
(d) Diakinesis

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The complex formed by a pair of synapsed homologous chromosomes is called 
(a) equatorial plate
(b) Kinetochore
(c) bivalent
(d) axoneme

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A stage in cell division is shown in the figure. Select the answer which gives correct identification of the stage with its characteristics.

                             

(a) Telophase             - Nuclear envelope reforms, Golgi complex reforms

(b) Late anaphase      -  Chromosomes move away from equatorial plate, Golgi complex not present

(c) Cytokinesis           -  Cell plate formed, mitochondria distributed between two daughter cells

(d) Telophase            -  Endoplasmic reticulum and nucleolus not reformed yet

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