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Question

How do Mendel's experiments show that traits may be dominant or recessive?


Solution

  • Mendel conducted the experiments using Pisum sativum or pea plant.
  • He selected homozygous tall (TT) and dwarf (tt) pea plants.
  • He crossed the tall pea plant with the dwarf pea plant.
  • It was observed that the  F$$_1$$ generation are all tall plants.
  • Thus, it was concluded that the gene causing tallness is dominant while the gene causing dwarfness is recessive.
  • The trait expressing itself in the hybrid is the dominant one. 
  • This experiment proves Mendel’s first law of inheritance.
  • It states that when a pair of contrasting factors is brought in a hybrid, one factor inhibits the appearance of the other, one which inhibits is the dominant one and which is inhibited is recessive.

Biology

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