1. Genetics:
Mendel’s Work
Omit Blue Text

2. Gregor Mendel Lived from 1822-1884 Priest – lived on a monastery
High-school teacher, gardener
Grew hundreds of pea plants
Over 10 years he studied the plants and formed the foundation of genetics

3. Vocabulary Trait = physical characteristic
Heredity = passing of traits from parents to offspring
Genetics = scientific study of heredity
Purebred = produces offspring with the same form of a trait as the parent

4. Mendel’s Experiments x Purebred Tall Purebred Short
He called this the parental generation or “P generation”

5. Mendel’s Experiments Result? The short trait had disappeared!
F1 Generation – “F” stand for filial or “son” in latin

6. Mendel’s Experiments +
So he crossed two of the plants from the F1 generation… +

7. Mendel’s Experiments The missing trait had reappeared! F2 Generation
What % are tall plants?
What % are short plants?

8. More Vocabulary Traits are controlled in pairs
Gene = factor that controls a trait
Allele = ½ of a gene – one from mom and one from dad

9. Chromosome
Alleles (letters)

10. Some alleles are dominant while others are recessive.

11. Dominant vs Recessive
Dominant alleles are traits that are always shown
Recessive alleles can be covered up or hidden when the dominant allele is present.
A trait expressed by a recessive allele will only show up if there is no dominant allele present.

12. In Mendel’s Experiments…
Tall Allele
Short Allele
is dominant over

13. Chromosome 1
Chromosome 2
1 Gene
2 Alleles
Chromosome Pair

14. Bb = Eye Gene
B = Brown
b = blue

15. Vocabulary Example: “Bb”
Hybrid - have two different alleles for a trait
Example: “Bb”
Recessive
Dominant

16. Questions?