1. Intro To Genetics

2. I. Two things influence who you are: A. Environment B. Heredity

3. II. Gregor Mendel (1822 – 1884) A. Father of genetics
B. Studied inheritance patterns
C. Crosses between pure-breeding pea plants

4. Contrasting traits: 1. tall or short 2. yellow or green
3. roll tongue or not

5. Human Contrasting Traits

6. A. Trait: variation of a particular characteristic
III. Basic Vocabulary
A. Trait: variation of a particular characteristic
B. Gene: unit of heredity information
C. Dominant: gene that masks another gene in a pair (T)
D. Recessive: gene that is hidden by the dominant gene (t)
Must have 2 recessive to show
E. Allele: either member of a pair of genes that determines a single trait

7. F. Homozygous (purebred): two genes in a pair are identical (TT or tt)
G. Heterozygous (hybrid): a dominant and recessive gene in a pair (Tt)
H. Genotype: genes present (bb)
I. Phenotype: expressed trait (brown)

8. Practice: 1. Which genes are dominant? q R T b N
2. Which gene are recessive?
a m T U
3. Which are heterozygous?
AA Gg Rr PP
Which will show the dominant trait?
Aa BB ff Gg
5. Which will show the recessive trait?
Aa bb ff WW