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Heredity and Evolution


  • Acquired traits-  a trait that an individual experiences during his lifetime

a) involves changes in non-reproductive tissues

b) cannot be passed on to the progeny

  • Inherited traits- distinguishing qualities or characteristics that one acquires from his/her ancestors.

a) involves changes in DNA or reproductive tissues.

b) transmitted to progeny

  • Heredity- transmission of characteristics or traits from parents to offsprings.
  • Variations- difference among individuals of a species and also among  offsprings of same parents.
  • Variations are of two types- heritable and non-heritable.
  • Basis of heredity- each trait is influenced by both maternal and paternal DNA.

Mendel’s work

  • Proposed- heredity is controlled by factors. Factors are now called genes.
  • Performed experiments on garden pea (Pisum sativum)
  • Used seven contrasting pairs of characters or traits to study heredity.
  • Dominant trait- able to express itself over another contrasting trait
  • Reces…

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