Genetics, Molecular Biology and Evolution-Development of Genetics [IFS (Forest Services) Botany]: Questions 1 - 9 of 17

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Question 1

Appeared in Year: 2017

Describe in Detail Subjective▾

Describe with illustrations about chromosomal behaviour during meiosis with translocation, inversion and duplication.

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Explanation

Meiosis

Meiosis is a process where single cell divide twice and produce cells containing half of the original genetic material.

Meiosis I

Chromosomal Behaviour During Meiosis

Meiosis II

Chromosomal Behaviour Meiosis II

Chromosomal Behaviour

  • In meiosis two rounds of chromosome segregation occur but only after single replication.
  • Pairing occur during prophas…

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Question 2

Describe in Detail Subjective▾

What is Industrial Melanism?

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Explanation

The process of evolution, adaptation and natural selection though discussed and accepted in the scientific community, there are very a few instances where the process was documented and witnessed. The example of Industrial Melanism is the classical example used in the illustration of the process of Natural Selection.

  • The Industrial Revolution of the…

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Question 3

Appeared in Year: 2020 (IAS)

Describe in Detail Subjective▾

Factors affecting recombination frequencies.

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Explanation

Recombination

It is process by which pieces of DNA are broken and recombined to produce new combinations of alleles.

This recombination process creates genetic diversity at the level of genes that reflects differences in the DNA sequences of different organism.

Factors Affecting Crossing Over

Maternal Age

Bridges shows in drosophila decreases in cross o…

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Question 4

Write in Short Short Answer▾

How to determine the annealing temperature for a PCR reaction.

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Question 5

Appeared in Year: 2020 (IAS)

Describe in Detail Subjective▾

Describe the following in about 150 words each:

Why are overlapping genes important? Discuss.

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Explanation

Beadle and Tatum presented the one-gene-one-protein theory, which states that one gene encodes for a single protein. However, if one gene had 1,500 base pairs, a protein of 500 amino acids would be produced. Furthermore, if the same sequence is read in two distinct ways, the same sequence of base pairs will manufacture two different amino acids. It…

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Question 6

Appeared in Year: 2020 (IAS)

Describe in Detail Subjective▾

Does Z-DNA play a regulatory role? Discuss critically.

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Explanation

One of the more intriguing findings of the previous decade was that purines and pyrimidines alternate down each strand of DNA and can construct left-handed double helices. A right-handed double helix is the Watson-Crick B-form of DNA. Z-DNA refers to the zigzagged routes of the sugar-phosphate backbones of the unique left-handed double-helical type…

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Question 7

Appeared in Year: 2022 (IAS)

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Write a note about RAPD PCR – Strength, weakness and application. (Paper II)

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Explanation

Random Amplified Polymorphic DNA (RAPD) : The goal of PCR is typically to create specified DNA fragments from highly specific primers. In the instance of RAPD (pronounced rapid) , short oligonucleotide primers are arbitrarily chosen to amplify a series of randomly dispersed DNA fragments throughout the genome. Arbitrarily primed PCR is another name…

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Question 8

Appeared in Year: 2019 (IAS)

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Discuss two DNA sequencing methods with suitable illustrations. Name two fully sequenced eukaryotic genomes with their sizes (Paper 2)

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Explanation

When a specific gene of interest or a DNA fragment is extracted, it is critical to sequence that bit of DNA. The arrangement of nucleotide bases along DNA՚s sugar phosphate backbone is referred to as its sequence. Because no technology can establish the sequence of bases in a complete gene in a single experiment, the entire gene must be broken into…

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Question 9

Appeared in Year: 2022

Describe in Detail Subjective▾

Describe the development of ascus in Neurospora. Why is Neurospora considered as a model for genetic studies (Paper-1)

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Explanation

Development of Ascus in Neurospora

Neurospora crassa provides several benefits for studying cross-over. During the vegetative phase of its life cycle, filamentous, coenocytic hyphae develop to create the haploid mycelium. Sexual reproduction occurs when two hyphae of the same mating type get together and their nuclei merge to generate a diploid zygo…

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