Learning Genetics?

[The-White-Elephant]

lower case = recessive, Capital case = Dominant

Thank you! So the “+” sign is? I can’t remember.

 

[Chicken poppy]

Hey, I didn’t get enough time to read the thread. Can you explain what lowercase and uppercase symbolize?

Oh sure! So if this is what you mean:

Their genotypes, lower is recessive and capital is dominant.

 

[Chicken poppy]

nickandia beat me to it haha!

 

[nicalandia]

Thank you! So the “+” sign is? I can’t remember.

Wildtype ancestry(Red Jungle Fowl origin)

 

[EmmaRainboe]

Thank you!

And yes. If a bird is bl/bl for the splash gene (black) and lav/lav for the lavender gene, then would the black phenotype of the splash gene show up as lavender because of the dilution of the lavender gene? (I hope this is more straightforward).

Yes.

bl/bl for the splash gene

A bird which is bl+/bl+ (black) does not carry any splash dilute genes.
If they did they would be:
Bl/bl+ (blue)
or
Bl/Bl (splash)

 

[EmmaRainboe]

Thank you!

And yes. If a bird is bl/bl for the splash gene (black) and lav/lav for the lavender gene, then would the black phenotype of the splash gene show up as lavender because of the dilution of the lavender gene? (I hope this is more straightforward).

Barring works by resticting the pigment depositing of eumelanin on and off while the feathers grow, leaving a “striped” appearance.

Barring is carried on the Z sex chromosome so because males have two Z chromozomes they can carry 0-2 barring genes. Female have one Z chromosome, so can only carry 0-1.

Having two copies of the barring gene restricts the eumelanin for longer, creating wider white bars. This means that in barred varieties of different breeds, Males are often lighter due to carrying two copies of the barring gene.

You can have different varieties of barring, such as cuckoo, or crisp lines, these are controlled by the same gene.

 

[nicalandia]

Barring works by resticting the pigment depositing of eumelanin on and off while the feathers grow, leaving a “striped” appearance.

Barring is carried on the Z sex chromosome so because males have two Z chromozomes they can carry 0-2 barring genes. Female have one Z chromosome, so can only carry 0-1.

Having two copies of the barring gene restricts the eumelanin for longer, creating wider white bars. This means that in barred varieties of different breeds, Males are often lighter due to carrying two copies of the barring gene.

You can have different varieties of barring, such as cuckoo, or crisp lines, these are controlled by the same gene.

There are multiple allelic mutations on the sex linked barring allele. I believe that the difference in phenotype between Cuckoo and Barred(crisp barring) is mostly due to two different allelic mutation instead of Slow vs Fast feather growth.

 

[myawesomepullets]

This is what I have so far:

For lavender/black:
Lav+/Lav+ or Lav+/lav is working (undiluted) black.
lav/lav is diluted black (lavender).

For blue/splash/black:
Bl/Bl is splash.
Bl/bl+ is blue.
bl+/bl+ is black.

For combs:
r+/r+, p+/p+ is single comb.
R/r+, p+/p+ or R/R, p+/p+ is rose comb.
r+/r+, P/p+ or r+/r+, P/P is pea comb.
R/R, P/P or R/r+, P/p+ is walnut comb.

For feather types: (I don't know all of it)
H+/H+ is normal feathers.
h/h is silkie-type feathers.

For barring:
B/B is a barred male. (with wider white bars?)
B/- is a barred female. (with thinner white bars?)

Correct me if any of this is wrong. I'd also like to know how other types of barring (cuckoo) occur and how frizzled feathering occurs and how to represent that as letters.

 

[myawesomepullets]

What would a bird expressing both blue and lavender (lav/lav and Bl/bl+) look like?

 

[nicalandia]

This is what I have so far:

For lavender/black:
Lav+/Lav+ or Lav+/lav is working (undiluted) black.
lav/lav is diluted black (lavender).

For blue/splash/black:
Bl/Bl is splash.
Bl/bl+ is blue.
bl+/bl+ is black.

For combs:
r+/r+/, p+/p+ is single comb.
R/r+, p+/p+ or R/R, p+/p+ is rose comb.
r+/r+, P/p+ or r+/r+, P/P is pea comb.
R/R, P/P or R/r+, P/p+ is walnut comb.

For feather types: (I don't know all of it)
H+/H+ is normal feathers.
h/h is silkie-type feathers.

For barring:
B/B is a barred male. (with wider white bars?)
B/- is a barred female. (with thinner white bars?)

Correct me if any of this is wrong. I'd also like to know how other types of barring (cuckoo) occur and how frizzled feathering occurs and how to represent that as letters.

Fixed for you.

E/E, B/B Barred/Cuckoo male
e+/e+, B/B Crele male