CALCULATING THE POTENTIAL EYE COLOUR OF KITTENS

Note: If you found this page through any means other than via the Pure Felinity site, you should be aware of the fact that this page was written about cyber cat breeding, not real cats, and that it is tailored to the breeding rules of this site. The genetics of this site are a simplified version of reality, so there may be some principles that do not hold true in real life.

Each eye colour is made up of three components: base colour, colour intensity and blue (stroma) tint. This page assumes that you already know how to work out the components making up the eye colours that you are planning to mate together. If you do not know how to do this, first read the page looking at how to use the Eye Colour Chart. Once you have broken down the eye colours that you want to mate together into their component parts, you are ready to work out the possible eye colours of the offspring.

The steps to work through:-

Step 1: Write out the base colours of the two cats to be bred.
Step 2: Write out the colour intensity levels of the two cats to be bred.
Step 3: Write out the blue tint levels of the two cats to be bred.
Step 4: Work out the possibilities for each of the factors.
Step 5: Working forward from the possibilities for each factor, work out the list of possible colours.

Using the process:-

For this example I will use a mating between a male with pale yellow eyes and a female with medium green eyes.

Step1: Write out the base colours of the two cats to be bred
Pale yellow has a base colour of yellow
Medium green has a base colour of yellow

Step 2: Write out the colour intensity levels of the two cats to be bred
Pale yellow has a colour intensity of level 1
Medium green has a colour intensity of level 2

Step 3: Write out the blue tint levels of the two cats to be bred
Pale yellow has a blue tint of level 0
Medium green has a blue tint of level 2

Step 4: Work out the possibilities for each of the factors
For each factor, the offspring can have the same level as either of the parents, or anything in between. If both parents have the same level, the offspring can only have that level. If the levels of the parents are only 1 level apart (e.g. level 1 and level 2), then the offspring can be either of these levels. If the levels of the parents are more than one level apart (e.g. level 1 and level 3), then the offspring can be either of these levels or the ones in between (e.g. level 1 or level 3, but also level 2).

Base Colour: Both parents yellow, so offspring also yellow
Colour Intensity: Parents are level 1 and level 2, so the offspring will be level 1 or level 2
Blue Tint: Parents are level 0 and level 2, so the offspring will be level 0, level 1 or level 2

Step 5: Working forward from the possibilities for each factor, work out the list of possible colours
Look at the chart, and note down all colours with a base colour of yellow, colour intensity of level 1 or level 2, and blue tint between level 0 and level 2.

That is colours number 1, 2, 10, 11, 19 and 20.

Those are pale yellow, medium yellow, pale green, pale yellow-green, pale aqua and medium green.

A More Complex Problem:-

When calculating the outcome of a more complicated problem, we follow the same process, breaking everything down step by step.

For example, a mating between a male with deep yellow-green eyes and a female with medium brown eyes. This gives us the following components:

Male (deep yellow-green): base colour yellow, colour intensity level 3, blue tint level 2
Female (medium brown): base colour brown, colour intensity level 2, blue tint level 0

This gives the following possibilities for the offspring:
Base colour: yellow (like Dad), brown (like Mum) or orange (in between the other two)
Colour intensity: level 2 (like Mum) or level 3 (like Dad) - NOTE: not level 1
Blue tint: level 0 (like Mum), level 2 (like Dad) or level 1 (in between the other two)

This means that the offspring could be any base colour with colour intensity of level 2 or level 3, and blue tint level 0, level 1 or level 2.

Base colour yellow, intensity level 2: colours number 2 (blue tint 0), 11 (blue tint 1) or 20 (blue tint 2)
Base colour yellow, intensity level 3: colours number 3 (blue tint 0), 12 (blue tint 1) or 21 (blue tint 2)
Base colour orange, intensity level 2: colours number 5 (blue tint 0), 14 (blue tint 1) or 23 (blue tint 2)
Base colour orange, intensity level 3: colours number 6 (blue tint 0), 15 (blue tint 1) or 24 (blue tint 2)
Base colour brown, intensity level 2: colours number 8 (blue tint 0), 17 (blue tint 1) or 26 (blue tint 2)
Base colour brown, intensity level 3: colours number 9 (blue tint 0), 18 (blue tint 1) or 27 (blue tint 2)

These give the following colours:
Medium yellow (number 2), pale yellow-green (number 11), medium green (number 20)
Deep yellow (number 3), medium yellow-green (number 12), deep yellow-green (number 21)
Medium orange (number 5), pale bronze (number 14), medium hazel (number 23)
Deep orange (number 6), medium bronze (number 15), deep bronze (number 24)
Medium brown (number 8), pale bronze-olive (number 17), medium coffee (number 26)
Deep brown (number 9), medium bronze-olive (number 18), deep bronze-olive (number 27)

If you are having any problems understanding this, post a message on the help forum (note: you must be a member of Pure Felinity to access this resource) with your problem, and someone should be able to help you understand.

If you want to try looking at some more complicated examples, see the calculation examples.


Also in this section:
Eye Colour Genetics
Understanding the Eye Colour Chart
List of Eye Colours and their Components
Calculating Outcomes (current page)
Calculation Examples


Go to:
Genetics Help Home
Eye Colour (current section)
Colours
The basics
Overview of the different genes used
Explanations of the genes
How to work out the results of a breeding
Some examples of breeding calculations
Further help