Genetics, Molecular Biology and Evolution-Gene Versus Allele [IFS (Forest Services) Botany]: Questions 1 - 4 of 4

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Question 1

Appeared in Year: 2015 (IAS)

Describe in Detail Subjective▾

Describe the structure, behavior, and significance of special types of chromosomes.

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Explanation

  • Chromosome that is additional to the regular karyotype of a species is called accessory chromosome.
  • It is also known as B chromosome and supernumerary chromosome.
  • It may or may not found in organism.
  • Mostly they are non-coding heterochromatic chromosome but certain some euchromatic segments.
  • Some they are said selfish genetic element due to their non-f…

… (281 more words, 7 figures) …

Question 2

Appeared in Year: 2019 (IAS)

Describe in Detail Subjective▾

Write explanatory notes on the following:

Polygenic inheritance

(Paper 2)

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Explanation

Character or trait refers to any heritable characteristic of a person. It consists of morphological, physiological, biochemical, and behavioural characteristics. Some traits are determined by a single or few genes. These properties are known as qualitative characteristics or oligogenic characteristics. Alternatively, certain traits are governed by …

… (595 more words) …

Question 3

Appeared in Year: 2023 (IAS)

Describe in Detail Subjective▾

Describe polygenic inheritance by giving suitable examples. (Paper 2)

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Explanation

Polygenic inheritance is a fascinating concept where traits aren՚t determined by a single set of genes, but rather by the combined effects of multiple genes and even environmental factors. Imagine it like baking a cake – the final flavor and texture depend on a recipe with several ingredients (genes) in certain proportions (alleles) , and maybe eve…

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Question 4

Appeared in Year: 2023 (IAS)

Describe in Detail Subjective▾

Explain multiple alleles and their characteristics. How are they different from pseudoalleles? (Paper 2)

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Explanation

Multiple alleles refer to the existence of more than two allelic forms of a gene within a population. In a population, any individual organism will carry only two alleles for a particular gene (one from each parent) . However, when there are more than two possible alleles for that gene in the entire population, the gene is said to have multiple all…

… (407 more words) …