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Go Back   Talk Budgies Forums > Budgie Talk > Budgie Breeding > Mutations and Genetics


Mutations and Genetics Learn about budgie genetics and the wide variety of mutations.
Thread Description:Trying to understand them better

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Old 02-18-2018, 12:43 AM
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Default Sex-Linked Mutations

I think I understand how sex-linked mutations are expressed (i.e. a female hen's male offspring are split for them so their female chicks will express) but am trying to further understand how it all works at a deeper level. So what would the genotype be of the budgies who express or are carriers for these sex-linked mutations? What does it take for a budgie to visibly express it as a phenotype?

Sex-linked mutations are carried on the X chromosome, right? So I thought sex-linked mutations would be expressed more commonly in males since they only carry one X (XY), so there's nothing for the mutation to "compete" against. Then females have 2 X's (XX) so if the gene on the other X is dominant over the sex-linked mutation, it wouldn't show. So let's take the cinnamon mutation, for example. Will a cinnamon hen pass down that sex-linked trait every time to all of her sons? And if those male chicks (F1 generation) were bred, would all of their female chicks (F2) express that mutation without fail? What exactly does it take for a budgie to express a sex-linked mutation, and are they all the same? As in, are there recessive and dominant sex-linked mutations?

I apologize if I'm completely off the mark, I'm just trying to better understand how all this works. And I'm pretty ignorant, as you guys can probably see. But I want to be a biologist so all of this fascinates me. Thanks for your patience in explaining all of this!

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Old 02-18-2018, 03:47 AM
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You are mostly right...except birds are different than mammals in that the hen is XY and the cocks are XX. So, with that in mind, and the fact that all sex-linked variety genes in budgies are also recessive, have another think through. I reckon it'll make more sense to you.
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Old 02-18-2018, 09:36 AM
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Hey Katie!

Genetics are fascinating, I actually am studying to be a biologist with a focus in genetics and cell biology at school currently

I wrote this sticky up a few months ago in which I explain sex-linked mutations.

https://www.talkbudgies.com/mutations...-all-mean.html

You've mostly got the idea right although as Toni said you've got the chromosomes switched!

Also, what toni means about the recessive sex-linked genes is that despite these genes not being traditionally recessive, birds having one copy of a sex-linked gene which have two X chromosomes (i.e male budgies) will not cause the gene to be phenotypically expressed. I'm pretty sure I cover that in the sticky too, if that doesn't make sense.

I hope this helps!
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Old 02-18-2018, 02:29 PM
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Quote:
Originally Posted by tonic View Post
You are mostly right...except birds are different than mammals in that the hen is XY and the cocks are XX.
Wow! Well thatís a big help in trying to understand this.

Iím always learning new things on here!

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Old 02-18-2018, 03:18 PM
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Quote:
Originally Posted by tonic View Post
birds are different than mammals in that the hen is XY and the cocks are XX.
Oh wow, yes that was the piece of the puzzle I was missing! That clears it all up so much more. Thank you!



Quote:
Originally Posted by StarlingWings View Post
Hey Katie!

Genetics are fascinating, I actually am studying to be a biologist with a focus in genetics and cell biology at school currently

I wrote this sticky up a few months ago in which I explain sex-linked mutations.

https://www.talkbudgies.com/mutations...-all-mean.html
That's so awesome! I can't wait until I can take classes like that at college. Thank you, I was trying to figure out which sticky would cover sex-linked mutations more. I tried to go back to Cute Little Birdies Aviary but their website hasn't been loading for me!
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