Genetics, Molecular Biology and Evolution-Sex Determination [IFS (Forest Services) Botany]: Questions 1 - 6 of 6

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Question 1

Appeared in Year: 2014

Describe in Detail Subjective▾

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

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Explanation

Lyon՚s Hypothesis

  • 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…

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Question 2

Appeared in Year: 2015

Write in Short Short Answer▾

X/A ratio is not only a primary sex determining signal but has several major regulatory genes in function. Discuss what role they play in sex differentiation, with suitable examples. (Paper II)

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Question 3

Appeared in Year: 2017

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Molecular basis of sex determination.

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Explanation

Sex Determination

  • It is a biological system that determine the development of the sexual characters of an organism.
  • Most of the mechanisms of the determination of the sex are controlled in molecular level.
  • They classified into these categories
    • Sex chromosome mechanism or Heterogamesis
    • Genic balance mechanism
    • Male haploidy or haplodiploidy mechanism
    • Single…

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Question 4

Appeared in Year: 2017

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With suitable example, explain the tripartite sex determination.

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Explanation

Sex Determination

  • It is a biological system that determines the development of the sexual characters of an organism.
  • In some angiosperm the tripartite sex determination is seen.

Tripartite Sex Determination

Involvement of three sex chromosome to determine the development of sexual characters of an organism. For example- XXX or XXY, etc.

For Example

  • In Ac…

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Question 5

Appeared in Year: 2020

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Write Note on: Chromosomal sex determination in higher plants (Paper-2)

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Explanation

Different Types of Sex Determination
  • In higher plants, the phrase “chromosomal sex determination” refers to the process that determines the gender of an individual plant depending on whether or not certain chromosomes that are associated with sexuality are present in that plant. In contrast to mammals, in which the chromosomes that determine sexuali…

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Question 6

Appeared in Year: 2023 (IAS)

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Describe the three modes of sexual reproduction in bacteria. (Paper 1)

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Explanation

Bacteria primarily reproduce asexually through processes like binary fission, where a single bacterial cell divides into two identical daughter cells. However, some bacteria are capable of sexual reproduction, which involves the exchange of genetic material between two bacterial cells. Here are the three main modes of sexual reproduction in bacteri…

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