The basic principals of Cat Genetics :

• Bi-Color kittens must have at least one Bi-Color parent.
• Bi-Color to Solid color will produce a ratio of : 50 % Solid and 50 % Bi-Color.
• Bi-Color to Bi-Color will produce a ratio of : 50 % Bi-Color, 25 % Solid and
  25 % Van Pattern.
• Van Pattern to Solid will produce a ratio of : 100 % Bi-Color.
• Van Pattern to Bi-Color will produce a ratio of : 50 % Van Pattern and 50 % Bi-Color.
• Van Pattern to Van Pattern will produce a ratio of : 100 % genetic Vans.
• Cats with a Dominant color shall have a parent or both parents that is or are Dominant.
• A tabby kitten must have at least one parent that is a tabby or shaded.
• A shaded cat must have at least one parent that is shaded.
• Shaded parents can have smoke kittens, but smoke parents can not have shaded kittens.
• Spotted tabby kittens must have at least one parent which is spotted tabby.
• Mackerel tabby kittens must have at least one parent which is a mackerel tabby.
• Two Colorpoint parents will only have Colorpoint kitten.
• Two recessive color parents ( Blue, Cream etc. ) can not produce a cat of Dominant color ( Red, Black, Tortie ).
• The colors and patterns in a pedigree, do not directly affect the color of the kittens. If is only the parents that can influence this, except where the recessive genes inherited, eg, Chocolate, lilac & Colorpoint.