Why do we not look like a Rhinoceros?

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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?

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The Legacy of Gregor Mendel

• Mendels Life
• A. 1843 gardener in a monastery in Brunn,
  Austria.
• B. 1851 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.

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Mendels 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.

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Mendels Pea Plants
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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.

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Mendels Principles

• 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.