Fsc part 2 online preparation for biology chapter 21 (Cell Cycle)

Online Short Questions For Chapter 7 "12th Class Biology Chapter 21 Short Questions Preparation "

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Biology - 12th Class Biology Chapter 21 Short Questions Preparation

Question # 1

Define non-disjunction of chromosomes. Or Define chromosomal non-disjunction.

  • Ans 1: It is chromosomal non disjunction,during which spindle fibers fail to attach with chromosomes and resulting unequal distribution of chromosomes occur.
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Prepare Complete Set Wise Questions For Chapter 7 "12th Class Biology Chapter 21 Short Questions Preparation "

12th Class Biology Chapter 21 Short Questions Preparation - Set 1

Question # 1

Define non-disjunction of chromosomes. Or Define chromosomal non-disjunction.

  • Ans 1: It is chromosomal non disjunction,during which spindle fibers fail to attach with chromosomes and resulting unequal distribution of chromosomes occur.
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12th Class Biology Chapter 21 Short Questions Preparation - Set 2

Question # 1

What is interphase? Write the name of its sub stages

  • Ans 1: The period of life cycle between two consecutive division is termed as the interphase,or misleadingly termed as the resting phase:\its sub stage are:
    i) G1 phase ii) S-phase iii) G2 phase
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12th Class Biology Chapter 21 Short Questions Preparation - Set 3

Question # 1

Write down the two functions of programmed death of a cell.

  • Ans 1: Programmed cell death helps in proper control of multicellular development which lead to deletion of entire structure (e.g, the tail of developing human embryos) or part of structure (e.g tissue between developing digits.)
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12th Class Biology Chapter 21 Short Questions Preparation - Set 4

Question # 1

Give causes and symptoms of Down's syndrome. Or Write symptoms of Down's syndrome.

  • Ans 1: The cause of Down's syndrome is the missing of 21stchromosomes due to non disjunction. The affected individuals have a flat,broad face,squint eyes with folds in the inner corner and protruding tongue,mental retardation and defective development of central nervous system.
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12th Class Biology Chapter 21 Short Questions

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