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

Define crossing over.Give its significance.

  • Ans 1: It is exchange of segments of chromosomes between non sister chromatids. Its significance is that,it provides raw material for evolution and also from new recombination of genes.
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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 crossing over.Give its significance.

  • Ans 1: It is exchange of segments of chromosomes between non sister chromatids. Its significance is that,it provides raw material for evolution and also from new recombination of genes.
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12th Class Biology Chapter 21 Short Questions Preparation - Set 2

Question # 1

Give two disadvantages of cloning..

  • Ans 1: Disadvantages of cloning are.
  • Ans 2: 1) All members of cloning are identical to each other and no genetic variability is produced.
    2) Member of clone does not show resistance to diseases and has less survival ability.
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12th Class Biology Chapter 21 Short Questions Preparation - Set 3

Question # 1

Define metastasis. Or what is metastasis?

  • Ans 1: The cell composing a malignant tumor or cancer,divide more rapidly,mostly invade surrounding tissues,get into the body's circulatory system,and set up areas of proliferation away from their site of original appearance.This spread of tumor cells and establishment of secondary area of growth is called metastasis.
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12th Class Biology Chapter 21 Short Questions Preparation - Set 4

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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21th Chapter

12th Class Biology Chapter 21 Short Questions

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