1. Why do we not look like a Rhinoceros? 2. Who is Gregor Mendel? 3. How is cross pollination differ from self pollination? 4. What is meant by dominant and recessive traits?

The Legacy of Gregor Mendel Mendel’s Life A gardener in a monastery in Brunn, Austria. B sent to the Univ of Vienna to study science & math (statistics). C. Returned to the monastery noticed that some pea plants produced tall & short plants. Other produces yellow or green seeds. D. Inheritance - passing of traits by heredity. E. Heredity - is the transmission of traits from parents to their offspring.

Mendel’s Experiments Experiment 1. Began with PURE for each trait (always produced that trait). Strain - used to denote all plants for a specific trait. 2. Self pollination - reproduction with a single parent that transfers pollen from the male part to the female part. 3. Got a plant for each strain, parental generation P1 generation. Then 4. Cross-pollination - transferred pollen from one P1 plant to P1 another. 5. Next, he recorded how many of each type known as a First filial generation, F1 generation. Then 6. Crossed-pollination the F1 generation. 7. Next, he recorded how many of each type known as a second filial generation F2 generation.

Mendel’s Pea Plants

Meaning of Results Suggested that something inside the plant controls expression (factor). Each trait had two possibilities, tall or short, green or yellow. Concluded that each trait resulted in an interaction of a pair of factors.

Mendel’s Principle’s 1. Principle of Dominance & Recessiveness  Dominant - One factor in a pair may mask another.  Recessive - One trait that was masked. 2. Principle of Segregation  The 2 factors for a characteristics segregated, or separated, during the formation of eggs & sperms. 3. Principle of Independent Assortment  Factors for different characteristics are distributed to reproductive cells independently.