D, E, F and G are the four daughter cells resulting when cell A undergoes meiosis as shown in the following diagram. If no crossing over has occurred which cells listed below, if any, are genetically identical?

(1) Cells B and C                               

(2) No two cells

(3) Cells D and E, cells F and G         

(4) Cells D, and F, Cell E and G

The DNA content of individual cells and the number of cells in each phase of a "cell cycle" can be determined, using flow cytometry. Which of the following combinations of "phase of a cell cycle and its corresponding DNA content" can be considered normal?
A. Diploid cells found in the Go or G1 phase.
B. Cells with twice the normal DNA content in the early M phase.
C. Cells with intermediate amounts of DNA in the S Phase.
D. Cells with twice the normal DNA content in the G2 phase.
(1) A and B               

(2) B and C             

(3) C and D             

(4) All are correct

Let a cell's generation time is 1 minute. In 20 minutes a culture tube (culture medium) is 1/8th filled with cells. When the tube will be fullfilled?

(1) 21 minutes     

(2) 23 minutes     

(3) 60 minutes     

(4) 160 minutes

The following diagram refers to a typical cell cycle.

Identify the parts marked as X, Y and Z.

1. X - G₁; Y - S; Z - G₂                      2. X - G₂; Y - S; Z - G₁

3. X - G₀; Y - S; Z - G₂                     4. X - G₁; Y - G₂; Z - G₀

What would be the number of chromosomes of the aleurone cells of a plant with 42 chromosomes in its roots tip cells?

(a) 21                             (b) 42                             (c) 63                             (d) 84

Identify the meiotic stage in which the homologous chromosomes separate while the sister chromatids remain associated at their centromeres:

(1) Metaphase I    

(2) Metaphase II  

(3) Anaphase I     

(4) Anaphase II

At which stage of meiosis does the genetic constitution of gametes is finally decided:

(1) Metaphase I    

(2) Anaphase II    

(3) Metaphase II   

(4) Anaphase I

Select the correct statement about G₁ phase:

(1) Cell is metabolically inactive

(2) DNA in the cell does not replicate

(3) It is not a phase of synthesis of macromolecules

(4) Cell stops growing

Which of the following number of cells can be expected from the human cell culture after 70hrs

1. 4

2. 8

3. Both 1 and 2

4. 2

Which of the following is a continuous process?
1. Cell growth (in terms of cytoplasmic increase)
2. Cell differentiation
3. DNA duplication
4. Cell division