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Science (English Medium) Class 12 - CBSE Question Bank Solutions for Biology

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Biology
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Sometimes cattle or even human beings give birth to their young ones that are having extremely different sets of organs like limbs/position of eye(s) etc. Comment.

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The image below shows the result of plating bacteria in a chromogenic medium after incorporating the gene of interest in the plasmid. Some plates had blue colonies; some plates had white colonies. A single bacterium extracted from Plate I, II, and III is shown below:

 

On the basis of your observations:

  1. Identify the plate(s) which is/are white. Give a reason.
  2. Identify the plate(s) which is/are blue. Give a reason.
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What do 'Y' and 'B' stand for in 'YAC' and 'BAC' used in Human Genome Project (HGP).

Mention their role in the project.

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Why is the Human Genome project called a mega project?

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Briefly describe the following:

Bioinformatics

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Write the percentage of the total human genome that codes for proteins and the percentage of discovered genes whose functions are known as observed during HGP.

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Expand 'SNPs' identified by scientists in HGP

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Write any six salient features of the human genome as drawn from the human genome project.

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Answer the following question.
Write the basis on which Alfred Sturtevant explained gene mapping.

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Answer the following question.
List the two methodologies which were involved in the human genome project. Mention how they were used.

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The human chromosome with the highest and least number of genes in them are respectively ______.

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Which was the last human chromosome to be completely sequenced?

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Diploid chromosome number in humans is ______.

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Both husband and wife have normal vision though their fathers were colourblind. The probability of their daughter becoming colourblind is ______.

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Haemophilia is more common in males because it is a ____________.

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A colourblind girl is rare because she will be born only when ______.

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A colourblind mother and normal father would have ______.

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Of a normal couple, half the sons are haemophilic while half the daughters are carriers. The gene is located on ______.

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Of both normal parents, the chance of a male child becoming colourblind are ______.

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Genes located on Y-chromosome are ______.

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