AGB 121: Principles of Animal Genetics and Population Genetics (2+1)

MONOHYBRID INHERITANCE

• Mendel studied the behavior of a single character alone first; he then studied two traits together.

 To view "Monohybrid Cross Animation"

• Some pea plants have long stem length (Tall) and others have short stem length (Dwarf).
• Pure-breeding plants were produced by self fertilization. A pure-breeding Tall plant for example would only produce Tall offspring.
• He cross pollinated a pure-breeding Tall plant with a pure-breeding Dwarf plant.
• All F₁ generation were Tall.
• Next he self-fertilized all the F₁ Tall plants.
• He noticed that 3/4 of the F₂ plants had long stem and about 1/4 had short stem (3:1).
• 3:1 is called Monohybrid Ratio.
• The Dwarf plants reappeared in the F₂ generation.