Let me get this straight...

[birde]

If two birds bred, say Cockatiels, both having the dominant gene but both carrying the recessive,
eg.
Mother - Bb
Father - Bb

B - normal grey
b - other mutation

There is a 25% chance offspring will have another mutation?

If I remember from Year 10 Science correctly it is like this:



And so, a pure bred non split normal grey tiel - 25%
A split normal grey tiel - 50%
A non-grey tiel (mutation) - 25%

[Andie]

I dont know anything about the genetics of cockatiels specifically. I do remember though that it is never as simple as the punnett square likes to make out. It does not account for any other variables in dominant and recessives which are attached to each other.

Eg people with red hair often have freckles also... the genes for those are believed to be linked.

Hopefully there is a genius on here who can say for sure for you...

[birde]

Ohh ok.
But do you know if there is still a chance of the offspring having a mutation if both the parents are carrying a mutation but normal grey themselves? (anyone?)

[hsmoscout]

Originally Posted by birde

Ohh ok.
But do you know if there is still a chance of the offspring having a mutation if both the parents are carrying a mutation but normal grey themselves? (anyone?)

That's my understanding!!!

[expressmailtome]

Yes that is possible. Things are different however once you take into account sex linked mutations such as the lutino mutation.

Matt

[Monica]

I used punette squares for the blue recessive gene. I don't have any for dominant or sex-linked genes. I made it as simple as possible, even though if you want to get technical, it's wrong. They were just made to be easy to understand - at least hopefully for everyone.


Green Bird x Green Bird = 100% Green Birds
Blue Bird x Blue Bird = 100% Blue Birds



Green Bird x Blue Bird = 100% Green split Blue Birds



Green Bird split Blue Bird x Blue Bird = 50% Green Birds split Blue and 50% Blue Birds



Green split Blue Bird x Green split Blue Bird = 25% Green Birds, 25% Blue Birds, 50% Green Birds Split Blue

[expressmailtome]

Here is a site with a genetics calculator that you can use: Genetic Calculator 1.3 Cockatiels . This is another one that seems easier to me: Cockatiel Mutation Genetics .

Matt

[Ashling]

I am learning genetics and punnet squares again for year 12 biology. They are GREAT FUN :D I am loving that I can try and predict what my tiels will produce! Still, I don't understand most of the tiel genetics, but I am learning.

[birde]

Is this correct:

Lutinos - only cocks

Cinnamons - only hens

?

[expressmailtome]

It is impossible for a pair to be able to produce lutino males and not lutino females. However, a pair can produce lutino females and not lutino males. This type of pairing could however produce split to lutino males. This applies to all sex linked mutations.

Matt