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.
- 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
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