A reduction step during meiosis is important because:
(1) It returns the chromosome number to normal before fertilization
(2) There is a mechanism for this
(3) Only one copy of each chromosome is necessary
(4) Otherwise chromosome copies would double each fertilization
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the following statements about meiosis is false?
(1) Haploid cells cannot divide meiotically
(2) DNA replication does not occur during interkinesis
(3) Assortment of homologous chromosomes on the equatorial plate during metaphase I is independent
(4) Of the four cells produced by meiosis, none are genetically identical to the parent cells but two are identical to each other
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyD, 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyLet 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIdentify 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAt 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologySelect 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA. Most dramatic period of cell cycle involving a major reorganization of virtually all components of the cell
B. It represents the phase when the actual cell division occurs
These statements (A & B) are concerned with
1. S-phase
2. G1 phase
3. M-phase
4. G2 phase
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology