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Principles Of Inheritance And Variation

Question
CBSEENBI12003116
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Pure tall plants are crossed with pure dwarf plants. In the F1 generation, all plants were tall. These tall plants of F1 generation were selfed and the ratio of tall to dwarf plants obtained was 3 : 1. This is called

  • dominance

  • inheritance

  • codominance

  • heredity

Solution

A.

dominance

Law of Dominance states that, in a cross of parents that are pure for contrasting traits, only one form of the trait will appear in the next generation.
Eg. When pure tall plant is crossed with pure dwarf plant. In F1 generation, all plants obtained were tall. When these tall plants were selfed, ratio of tall to dwarf plants obtained was 3 : 1.

Therefore, allele of tallness is dominant to allele of dwarfness. 

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