1. 7A – The Origin of Modern Genetics

2. 1. Gregor Mendel – used peas to study how organisms inherit traits.
2. Mendel’s work was ignored for over 50 years.
3. Purebred – factors for a particular trait are the same, ex: both green peas
4. Hybrid – factors for a particular trait are different, ex: green peas and yellow peas.

3. 5. Cross – mating of individuals to see how traits are inherited.
6. Dominant – the boss, factor that has the most influence on a trait (ex: hair color)
7. Recessive – the yes man, is submissive to the dominant trait.

4. 8. Capital letter represents a dominant trait. Example: T.
9. Lower case letter represents a recessive trait. Example: t.

5. 10. Each organism has two factors for every trait.
Height: T=tall, t=short.
TT = purebred tall
Tt = hybrid tall
tT = hybrid tall
tt = purebred short