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Analyse the events during every stage of the cell cycle and no
Biology
Biology

Class 11

NCERT

Publisher:
NCERT
Subject:
Biology
1

Chapter 1: The Living World

11 questions

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2

Chapter 2: Biological Classification

12 questions

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3

Chapter 3: Plant Kingdom

12 questions

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4

Chapter 4: Animal Kingdom

15 questions

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5

Chapter 5: Morphology of Flowering Plants

15 questions

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6

Chapter 6: Anatomy of Flowering Plants

12 questions

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7

Chapter 7: Structural Organization in Animals

14 questions

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8

Chapter 8: Cell: The Unit of Life

14 questions

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9

Chapter 9: Biomolecules

15 questions

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10

Chapter 10: Cell Cycle and Cell Division

16 questions

Q1
Can there be DNA replication without cell division?
Q2
Analyse the events during every stage of the cell cycle and notice how the following two parameters change:
(i) Number of chromosomes (N) per cell 
(ii) Amount of DNA content (C) per cell
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11

Chapter 11: Transport in Plants

16 questions

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12

Chapter 12: Mineral Nutrition

10 questions

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13

Chapter 13: Photosysnthesis in Higher Plants

9 questions

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14

Chapter 14: Respiration in Plants

12 questions

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15

Chapter 15: Plant Growth and Development

11 questions

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16

Chapter 16: Digestion and Absorption

15 questions

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17

Chapter 17: Breathing and Exchange of Gases

14 questions

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18

Chapter 18: Body Fluids and Circulation

14 questions

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19

Chapter 19: Excretory Products and their Elimination

12 questions

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20

Chapter 20: Locomotion and Movement

10 questions

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21

Chapter 21: Neural Control and Coordination

12 questions

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22

Chapter 22: Chemical Coordination and Integration

9 questions

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Question
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Solving time: 5 mins

Analyse the events during every stage of the cell cycle and notice how the following two parameters change:
(i) Number of chromosomes (N) per cell 
(ii) Amount of DNA content (C) per cell

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Updated on: Dec 7, 2022

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Biology (NCERT)

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Analyse the events during every stage of the cell cycle and notice how the following two parameters change:
(i) Number of chromosomes (N) per cell 
(ii) Amount of DNA content (C) per cell
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During meiosis, the number of chromosomes and the amount of DNA in a cell change.
(i) Number of chromosomes (N) per cell
During anaphase I of the meiotic cycle, the homologous chromosomes separate and start moving toward their respective poles. As a result, the bivalents get divided into two sister chromatids and receive half the chromosomes present in the parent cell. Therefore, the number of chromosomes reduces in anaphase I.
(ii) Amount of DNA content (C) per cell
During anaphase II of the meiotic cycle, the chromatids separate as a result of the splitting of the centromere. It is the centromere that holds together the sister chromatids of each chromosome. As a result, the chromatids move toward their respective poles. Therefore, at each pole, a haploid number of chromosomes and a haploid amount of DNA are present. During mitosis, the number of chromosomes remains the same. The DNA duplicated in the S phase gets separated in the two daughter cells during anaphase. As a result, the DNA content (C) of the two newly-formed daughter cells remains the same.
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Question Text
Analyse the events during every stage of the cell cycle and notice how the following two parameters change:
(i) Number of chromosomes (N) per cell 
(ii) Amount of DNA content (C) per cell
Updated OnDec 7, 2022
TopicCell Cycle and Cell Division
SubjectBiology
ClassClass 11
Answer TypeText solution:1 Video solution: 1
Upvotes133
Avg. Video Duration3 min