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Principles of Inheritance and Variation question

2016 · Q69
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Principles of Inheritance and Variation question

2016 · Q69

NEETBiologyPrinciples of Inheritance and VariationMCQ+4 / −1
Match the terms in Column-I with their description in Column-II and choose the correct option :
Column-I Column-II
(a) Dominance (i) Many genes govern a single character
(b) Codominance (ii) In a heterozygous organism only one allele expresses
itself
(c) Pleiotropy (iii) In a heterozygous organism both alleles express
themselves fully
(d) Polygenic inheritance (iv) A single gene influences many characters
  1. A
    (a) - (ii), (b) - (iii), (c) - (iv), (d) - (i)
  2. B
    (a) - (iv), (b) - (i), (c) - (ii), (d) - (iii)
  3. C
    (a) - (ii), (b) - (ii), (c) - (iv), (d) - (iii)
  4. D
    (a) - (iv), (b) - (iii), (c) - (i), (d) - (ii)
View written solutionFree

Correct answer: A

Let's match the terms in Column-I with their descriptions in Column-II:

  • (a) Dominance: Describes a relationship between alleles of a gene, where one allele masks the expression of another allele at the same locus.
  • (b) Codominance: Occurs when both alleles at a locus are expressed and the phenotype is a combination or simultaneous expression of both alleles.
  • (c) Pleiotropy: Occurs when one gene influences multiple different phenotypic traits.
  • (d) Polygenic inheritance: This term refers to a situation where a single trait is controlled by more than one gene (often, many genes contribute to the phenotype).

Now we match them with the descriptions:

  • (a) - (ii) "In a heterozyous organism only one allele expresses itself" aligns with the concept of Dominance.
  • (b) - (iii) "In a heterozyous organism both alleles express themselves fully" is correct for Codominance.
  • (c) - (iv) "A single gene influences many characters" corresponds to Pleiotropy.
  • (d) - (i) "Many genes govern a single character" is the definition of Polygenic inheritance.

Therefore, the correct match is:

Option A

(a) - (ii), (b) - (iii), (c) - (iv), (d) - (i)

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