Plant Breeding, Biotechnology and Biostatistics-Heterosis Breeding [IAS (Admin.) Mains Botany]: Questions 1 - 6 of 6

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Question 1

Appeared in Year: 2013 (IFS)

Describe in Detail Subjective▾

Write short notes on: Heterosis

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Explanation

Heterosis

  • Heterosis is defined as the improvement in performance by individual offspring form the crossing over the performance of the parent population and increase in growth, size, yield or other characters in hybrids over those of the parents.
  • The increased productivity or superiority over the parents is known as Heterosis or hybrid vigour.

History…

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Question 2

Appeared in Year: 2020

Write in Short Short Answer▾

Discuss inbreeding depression versus Heterosis.

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Question 3

Appeared in Year: 2018

Describe in Detail Subjective▾

Enumerate the different causes of heterosis

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Explanation

Dominance

  • Davenport (1908) , Bruce (1910) , and Keeble and Pellew (1910) presented this hypothesis (1910) .
  • This is the most frequently recognized cause of heterosis.
  • According to this idea, heterosis occurs as a result of dominant allele superiority when recessive alleles are detrimental; in this case, the deleterious recessive genes of one parent ar…

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Question 4

Appeared in Year: 2021

Describe in Detail Subjective▾

Explain the technique used in producing androgenic haploids and its applications in agriculture.

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Explanation

Technique

In Vivo

  • Androgenesis is the process through which an egg cell with a male nucleus develops into a haploid. Before fertilization, the egg nucleus must be inactivated or destroyed for effective in vivo androgenesis.
  • Gynogenesis is the process by which an unfertilized egg may be managed to grow into a haploid plant (through delayed pollination)…

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Question 5

Appeared in Year: 2020

Describe in Detail Subjective▾

Describe the significance and uses of the following: Polyploidy in plant breeding

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Explanation

Polyploidy occurs in plant species having three or more genomes. Multiplications of the basic set of chromosomes occur. In the Chrysanthemum basic set, for example, . Its species and hybrids all have multiples of nine, such as 18,27, 36, and 45. The fundamental set in Nicotiana and Solanum is

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Question 6

Appeared in Year: 2022 (IFS)

Describe in Detail Subjective▾

Explain how the hybrid plants express heterosis. (Paper 2)

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Explanation

When two homozygous inbred (true breeding lines established via continuous inbreeding) of genetically dissimilar components are crossed, the resultant hybrids are frequently strong, vigorous, productive, and taller than either parent.

Heterosis, or hybrid vigour, refers to this enhanced production or superiority over the parents. Heterosis is descri…

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