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Biotechnology : Principles and Processes

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Biology

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Biology

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

When two unrelated individuals or lines are crossed, the performance of F1 hybrid is often superior to both its parents. This phenomenon is called

  • transformation

  • splicing

  • metamorphosis

  • heterosis


D.

heterosis

The superiority of hybrids over either of the parents (dominant or recessive is called hybrid vigour (G. shull). Heterosis is equivalent of hybrids vigour.

The superiority of hybrids over either of the parents (dominant or recessive is called hybrid vigour (G. shull). Heterosis is equivalent of hybrids vigour.


What are BACs and YACs ?

BACs and YACs are artificial chromosomes from bacteria and yeast used for efficient gene transfer and gene sequencing.

What is the role of restriction endonuclease ?

Restriction endonucleases are specific enzymes which can cleave double stranded DNA at specific sites called recognition sequences. Restriction endonucleases provide protection to the bacteria by restricting the growth of bacteriophages. They also serve as tools for Recombinant DNA technology.


What is genetic engineering ?

Genetic engineering is a technique for artificially and deliberately modifying DNA (genes) to suit human needs. It is used to change the genetic makeup of the cells by using Recombinant DNA technology 

Define recombinant DNA.

Recombinant DNA is the artificially created DNA which incorporates DNA segments from different sources into one.

Name the soil bacterium which contain gene for production of endotoxins.

Bacillus thuringiensis.