Inheritage:

As I wrote before a breeder of birds has to know something of inheritage.
In a lot cases this is not so most people buy two birds and someone tells them which kind of inheritage young birds they give.
A lot of times it ends up in disapointment.
I don't know everything of course, expecially if a bird has more mutations  it is difficult to predict there inheritage.
That's why I use programs.
 

Now something in theory.
I have tried to be as clair as can be, and to write things down in normale language.
If you have any questions, please ask.
There are several kinds of inheritage, down here the kinds of the Roseicollis:

Recessive inheritage:

This is a form of mutation of which both parents can be split.
The mutation has to exist in both parents in order to apear in the young birds.
 

So in other words: If you want to breed a mutation, the mutation has to exist in both parents.( split x split or mutation x split)
for example Aqua, Turquiose, edged dilute,, Fallow and orangeface

Sex-linked inheritage:

In this mutation the male bird is importent, if he is a split you can get all this colours.
Most of the time you get female birds.
If you choose this mutation of a male bird, all daughters will have the same colour as their father.

So if you want to breed male birds, you always have to breed split x mutation or mutation x mutation in order to get for instance lutino male.
for example lutino, pallid, cinnamon and opaline.

Dominant:

It is already in the name dominant is inheritable, you only need a mutation of a parent bird in order to get the same mutation.

Of this mutation are no split birds.
For example  pied and de violet factor.
There are only single and double factored birds (the factor does exist on one or both chromosoms of the bird).
 

The only way to discover this is bij breeding with the bird :

Pied EF x Green = Pied EF en Green

Pied DF x Green of  Green x Pied DF = Pied EF

So if you only get pied of a combination , the parents are double factored Pied

Bij breeding the birds with the knowledge of this information and to combine the mutations, you can expect beautiful coulorful birds.

Calculate your own colour with this program.