Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →
Sign in

Principles of Inheritance and Variation question

2019 · Q42
Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.
  1. PYQ Library
  2. /NEET
  3. /Biology
  4. /Principles of Inheritance and Variation
  5. /2019 · Q42

Principles of Inheritance and Variation question

2019 · Q42

NEETBiologyPrinciples of Inheritance and VariationMCQ+4 / −1
In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and in F1 generation, pink flowers were obtained. When pink flowers were selfed, the F2 generation showed white, red and pink flowers. Choose the incorrect statement from the following :
  1. A
    Ratio of F2 is 14{1 \over 4}41​ (Red) : 24{2 \over 4}42​ (Pink) : 14{1 \over 4}41​ (White)
  2. B
    Law of Segregation does not apply in this experiment
  3. C
    This experiment does not follow the Principle of Dominance
  4. D
    Pink colour in F1 is due to incomplete dominance
View written solutionFree

Correct answer: B

Inheritance of flower colour in Snapdragon is a classic example for incomplete dominance.


In a cross between true breeding red flower (RR) and true breeding white flower (rr) produced a pink flower (Rr).


When the pink coloured flower of F1 generation was selfed, F2 generation produced plants with red flowers, pink flowers and white flowers in the ratio of 1 : 2 : 1. Here, both red and white flowers were not dominant over each other. Both tried to express their traits and hence an intermediate colour of both red and white resulting in pink colour flowers. Thus, genes for flower colour in snapdragon is an exception of Mendel's first principle i.e. Law of dominance. Law of segregation is universally applicable.

PreviousNext

More from Principles of Inheritance and Variation

  • Select the incorrect statement.2019 · MCQ
  • Which of the following pairs is wrongly matched?2018 · MCQ
  • Which of the following characteristics represent 'Inheritance of blood groups' in humans? a. Dominance b. Co-dominance c. Multiple allele d. Incomplete dominance e. Polygenic inheritance2018 · MCQ
  • A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by2018 · MCQ
  • Among the following characters, which one was not considered by Mendel in his experiments on pea?2017 · MCQ
  • Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct statement.2017 · MCQ
  • The genotypes of a Husband and Wife are IAIB and IAi. Among the blood types of their children, how many different genotypes and phenotypes are possible?2017 · MCQ
  • A disease caused by an autosomal primary non-disjunction is :2017 · MCQ