1. Punnett Squares

2. Probability
Probability is the likelihood that a particular event will occur.
Punnett Squares:
Show all possible combinations of a genetic cross.
Determine the genes for a particular set of offspring.

3. Example Punnett Square Pure Bred Cross
Key:
H= Dominant (tall plant)
h= Recessive (short plant)

4. Phenotype & Genotype
A phenotype describes what an organism looks like.
A genotype describes the allele combination of an organism.

5. Example Phenotype & Genotype
Phenotype: (tall or short)
Tall: 100%
Short: 0%
Genotype: (allele combinations)
Hybrid: 100%
Pure Dominant: 0%
Pure Recessive: 0%

6. Another Example Cross a hybrid (Hh) with another hybrid (Hh)
Draw a punnett square showing this cross
(TRY THIS ONE BY YOURSELF BEFORE CHECKING YOUR WORK!)

7. Hybrid Cross Example Phenotype: Genotype: Tall: 75% Short: 25%
Pure Dominant: 25%
Pure Recessive: 25%