Which one of the following statements about the particular entity is true?

  • Centromere is found in animal cell which produces ester during cell divison

  • the gene for producing insulin is present in every body cell

  • Nucleosome is formed of nucleotides

  • Nucleosome is formed of nucleotides


C.

Nucleosome is formed of nucleotides

A scientist has analysed the human DNA sequence present in a human -mouse somatic cell hybrid line possessing a translocation involving human chromosome-II and X. This data indicates that the human insulin gene is located on the short arm of chromosome-II in everybody cell but is not expressed in all cells.

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Which one of the following symbols and its representation, used in human pedigree analysis is correct?

  •  = Mating between relatives

  •  = unaffected male

  •  = Unaffected female

  •  = Unaffected female


A.

 = Mating between relatives

 = Mating between relatives

 = unaffected female

 = Unaffected male

 = Unspecified Sex

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The fruit fly, Drosophila melanogaster was found to be very suitable for experimental verification of chromosomal theory of inheritance by Morgan and his colleagues because

  • It reproduces parthenogenetically

  • a single mating produces two young files

  • smaller female is easily recognisable from larger male

  • smaller female is easily recognisable from larger male


D.

smaller female is easily recognisable from larger male

The fruit fly, Drosophila melanogaster was found to be very suitable for experimental verification of chromosomal theory of inheritance by Morgan and his colleagues because

* It completes its life cycle in a very short period (ie, about two weeks).
* a single mating produces many offsprings.
* larger female is easily recognisable from the smaller male.

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Select the correct statement from the ones given below with respect to dihybrid cross. 

  • Tightly linked genes on the same chromosome show higher recombinations

  • Genes far apart on the same chromosome show very few recombinations

  • Genes loosely linked on the same chromosome show similar recombinations as the tightly linked ones.

  • Genes loosely linked on the same chromosome show similar recombinations as the tightly linked ones.


D.

Genes loosely linked on the same chromosome show similar recombinations as the tightly linked ones.

Recombination is a rearrangement of genes during meiosis so that a gamete contains a haploid genotype with a new a gene combination. Morgan and his group found that when genes were grouped on the same chromosome, some genes were very tightly linked (showed very low recombination), while other were loosely linked (showed higher recombination). 

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In genetic engineering, a DNA segment (gene) of interest, is transferred to the host cell through a vector. Consider the following four agents (A-D) in the regard and select the correct option about which one or more of these can be used as a vector/vectors
A) A bacterium
B) Plasmid
C) Plasmodium
D) Bacteriophage

  • A, B and D only

  • A only

  • A and C only

  • A and C only


D.

A and C only

Plasmids are the extrachromosomal DNA found in bacterial cells. These are commonly used as vectors in genetic engineering programmes because these have the capacity of binding with eukaryotic DNA. 
A bacteriophage is a virus that is parasitic within a bacterium. These also, are the important tools in genetic engineering as cloning vectors.

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