Genetics, Molecular Biology and Evolution (IFS (Forests Services) Botany (Mains)): Questions 1 - 8 of 15

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Question number: 1

» Genetics, Molecular Biology and Evolution » Mutation

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Essay Question▾

Describe in Detail

Give two popular examples where genetic differences influence induction of mutation. (Paper 2, Section A)

Explanation

What is Mutation?

A mutation is a permanent change in the sequence of DNA.

Mutations are physical changes in genes and chromosomes.

They may be confined to a single cell or may be transmitted from one cell to another within a multicellular organism or may be transmitted from one generation to another through mutation in the gametes.

Induction of mutati

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Question number: 2

» Genetics, Molecular Biology and Evolution » Linkage and Crossing Over

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Appeared in Year: 2015

Essay Question▾

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What are the merits of pedigree methods? (Paper 2, Section A)

Explanation

What is Pedigree Method?

  • Individual plants are selected from F2 and the subsequent generation and their progenies are tested.

  • Pedigree record is the record of the entire parent’s offspring relationship in this process

  • Selection of individual plant is continued till the progenies show no segregation.

  • Selection is done among the progenies as there would

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Question number: 3

» Genetics, Molecular Biology and Evolution » Prions and Prion Hypothesis

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Appeared in Year: 2015

Essay Question▾

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Suggest why prions should not be included among viruses. (Paper 2, Section A)

Explanation

  • Prions are infectious agents of diseases in animals and humans and probably represent the simplest form of life on earth.
  • Prions are rod-shaped particles and consider as smaller than viruses.
  • The rods contain one prion protein is called PrP (prion protein).
  • Viruses contain DNA or RNA, which specify the structure of proteins. The genetic information in

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Question number: 4

» Genetics, Molecular Biology and Evolution » Linkage and Crossing Over

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Appeared in Year: 2015

Essay Question▾

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How will you distinguish cytologically between paracentric inversion and pericentric inversion? (Paper 2, Section A)

Explanation

Paracentric:

  • Paracentric inversions do not occur in the centromere.

  • Crossing over only occurs in the out the loop in one arm of the chromosome.

  • The result is a large loop in where recombination occurs in only part of the loop.

  • When crossover occurs within the loop, it causes the cells to die during meiosis.

  • This means that the only possible outcomes for

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Question number: 5

» Genetics, Molecular Biology and Evolution » Genetic Code

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Appeared in Year: 2015

Essay Question▾

Describe in Detail

Is the genetic code universal? (Paper 2, Section A)

Explanation

What is genetic code?

  • The set of DNA and RNA sequences that determine the amino acid sequences used in the synthesis of an organism’s proteins.

  • The set of 64 codons are corresponding to the 20 amino acids which are used for protein synthesis and as the signals for starting and stopping protein synthesis.

  • It is the biochemical basis of heredity and nea

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Question number: 6

» Genetics, Molecular Biology and Evolution » Sex Chromosomes

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Appeared in Year: 2014

Essay Question▾

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What is accounted for by Lyon’s hypothesis? Cite an example. (Paper 2 - Section A)

Explanation

  • The Lyon’s hypothesis was described by Mary Lyon in 1962.

  • The Lyon’s hypothesis does not related to germ cells and explains the phenomenon of heterozygous female carries of X-lined recessive disorders showing features of the condition.

  • The Lyon’s hypothesis was also explains the phenomenon of Barr bodies.

  • The Lyon hypothesis relates to what happens to

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Question number: 7

» Genetics, Molecular Biology and Evolution » Sex Determination

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

What is accounted for by Lyon’s hypothesis? Cite an example. (Paper 2)

Explanation

  • Whenever the number of X chromosome was two or more than two; the number of Barr bodies was One Less than the number of X chromosomes. Thus, in normal female only one active X chromosome is present.

  • One bare body is present in XX female and XXY male one bare bodies is present.

  • In XXXY male and XXX Meta female two Barr body is present.

  • Two X chromosome

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Question number: 8

» Genetics, Molecular Biology and Evolution » Mutation

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

With U’s triangle explains the role of amphiploides in evolution of crop plants. (Paper 2)

Explanation

  • An allopolyploid resulting due to chromosome doubling in a sterile hybrid derived from hybridization between two unrelated diploid species is also called as “amphidiploid”. And if the paternal species are polyploids the derivation will be called as “amphipolypliod”.

  • Allopolyploidy is the product of interspecies hybridization. Allopolyploids arise vi

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