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.
EditExplanation
- 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)
EditExplanation
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)
EditExplanation
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…
… (271 more words) …
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)
EditExplanation
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) …