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Principles of Inheritance and Variation question

2010 · Q48
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Principles of Inheritance and Variation question

2010 · Q48

NEETBiologyPrinciples of Inheritance and VariationMCQ+4 / −1
In antirrhinum two plants with pink flowers were hybridized. The F1 plants produced red, pink and white flowers in the proportion of 1 red, 2 pink and 1 white. What could be the genotype of the two plants used for hybridization ? Red flower colour is determined by RR, and White by rr genes -
  1. A
    rrrr
  2. B
    rr
  3. C
    Rr
  4. D
    RR
View written solutionFree

Correct answer: C

The given situation is an example of incomplete dominance where phenotype found in F1 generation do not resemble either of the two parents. The genotype of the two plants used for cross will be

AIPMT 2010 Mains Biology - Principles of Inheritance and Variation Question 123 English Explanation
The incomplete dominance of dominant allele (here ‘R’) over recessive allele (here ‘r’) could be due to mutations (insertion, deletion, substitution or inversion of nucleotides). The mutant allele generally produces a faulty or no product. This modification in the product may lead to incomplete dominance of the (unmodified) wild type dominant allele.

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