1. Hello Punnett Squares!
OOOH, sounds like fun!

2. Punnett Squares
Punnett squares- a method used to establish the probabilities of the results of a genetic cross.
Developed by R.C. Punnett ( ).
Punnett devised the "Punnett Square" to depict the number and variety of genetic combinations.

3. Monohybrid cross- a cross between individuals that involves one pair of contrasting traits
This example represents the probability of inheriting genes that will result in a purple or white flower.

4. Some basic rules about completing Punnett squares:
Genes occur in pairs: BB, Bb, bb
BB- homozygous dominant (pure dominant)
Bb- heterozygous (hybrid)
bb- homozygous recessive
Traits are represented by letters- the capital letter refers to the dominant trait, the small letter refers to the recessive trait.
Below we are crossing a heterozygous black mouse with a homozygous white mouse. The black gene is dominant and the white gene is recessive.
In a pair of genes the dominant gene occurs first Bb not bB.

5. Bb bb
Using the Punnett square method it can be determined that when a heterozygous black mouse (Bb) is crossed with a homozygous white mouse (bb) there is a 50% chance that there will be a black mouse for each time a mouse is produced and a 50% chance that a white mouse will be produced for each time a mouse is produced. Notice that the chance of producing a black mouse will be one that has the gene for white.

6. When a heterozygous brown-eyed Hello Kitty is crossed with a homozygous blue-eyed Hello Kitty, there is a 50% or 2 in 4 chance that there will be a blue-eyed Hello Kitty.
Bb bb

7. Bb bb b B Bb bb