Heredity and Evolution

• 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
• Recessive trait-unable to express its effect in the presence of a dominant trait
• Mendel repre…