1. Gregor Mendel (1822 – 1884) 7th Grade Heredity GLE 0707.4.4 √ 0707.4.5 SPI 0707.4.4

2. FATHER OF GENETICS

3. Gregor Mendel Born on July 22, 1822 in Heizendorf, Austria
Educated in Math and Science at the University of Vienna
Entered monastery in 1853 as a gardener
Began experimenting with peas in 1856
Tested over 28,000 pea plants
Not widely accepted until 1900

4. Mendel’s Observations

5. Purebred Plants

6. Cross Pollination

7. Purple Flowers

8. Traits Studied Trait Offspring Produced Missing Trait Seed Shape Round
Wrinkled
Seed Color
Yellow
Green
Pod Color
Pod Shape
Full
Flat
Plant Height
Tall
Short
Flower Position
At junctions
At tips of branches
Flower Color
Purple
White

9. Where did the missing traits go?
Did they just go away?

10. NO! Each missing trait is covered up. These traits are recessive.
The traits that appears in the offspring are dominant.
If a dominant trait is present it will always cover up a recessive trait.
Only when there is no dominant trait present will the recessive trait appear in the offspring.

11. F2 Generation Crossed two hybrid plants (F1)
Produced three purple flowering plants and one white flowering plant
The white flowering plant was absent of any dominant allele (recessive)
The purple flowering plants had at least one dominant allele

12. Mendel died in 1884
Not widely accepted until 1900
At that time, three different scientist came to the same conclusion as Mendel
Since that time Mendel has been known as the Father of Genetics