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 "

Try The Short Questions For 12th Class Biology Chapter 21 Short Questions Preparation

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Biology - 12th Class Biology Chapter 21 Short Questions Preparation

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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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

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 Preparation - Set 2

Question # 1

What is Klinfelter's syndrome?

  • Ans 1: The individual have an additional sex chromosome i.e,47.(44+xxy).They are phenotypically male but have frequently enlarged breast,tendency to tallness,obesity,small testes with no sperms at ejaculation and under development of Secondary sex characters.
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12th Class Biology Chapter 21 Short Questions Preparation - Set 3

Question # 1

What change occurs in dividing cell during zygotene?

  • Ans 1: Pairing of chromosomes takes place during the zygetene stage of the meiosis.
    Pairing may start from center to towards end or may start from one end to another end.
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12th Class Biology Chapter 21 Short Questions Preparation - Set 4

Question # 1

Give four importance of mitosis.

  • Ans 1: i) It transfers unchanged genetic information to the daughter cells
    ii) It helps in all types of asexual reproduction like cloning,tissue culture etc
    iii) It helps in healing of wounds
    iv) It maintains the chromosomes number constant.
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21th Chapter

12th Class Biology Chapter 21 Short Questions

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