Peafowl 201: Further Genetics- Colors, Patterns, and More

[Birdrain92]

Quote:
Because the Purple allele loci is on the Z chromosome not the W. Peahens get the W from their mother. Since there's no Purple or other sex link allele on the W chromosome female has no say in the color of their daughter. If they are sex link the son will be at least split.

 

[Dany12]

http://learn.genetics.utah.edu/content/pigeons/sexlinkage/

"Having two copies of a gene can be important when one copy is “broken” or defective. A functional second copy can often work well enough on its own, acting as a sort of back-up to prevent problems."

That's why the new mutations of sexe linked color come first by the female ?

 

[Kedreeva]

Sex linked :
They say ...:
[COLOR=333333]
[/COLOR][COLOR=333333]"Purple female x Blue male = Blue split Purple males and Blue females"[/COLOR]

Why the Purple peahen Can not produce at least some Purple peachicks female ? .... female need only ONE gene Purple to show the sex linked color.This gene can't come from the mother ... why ?

Because in birds, the sex chromosomes are ZZ for males and ZW for females and the sex linked colors like purple are carried only on the Z chromosome. Females only donate the W chromosome when producing female offspring, therefore the male always has to donate the Z to any potential female offspring, and if he has no purple gene to donate, no female offspring of that pair can be purple.

 

[Kedreeva]

http://learn.genetics.utah.edu/content/pigeons/sexlinkage/

"[COLOR=333333]Having two copies of a gene can be important when one copy is “broken” or defective. A functional second copy can often work well enough on its own, acting as a sort of back-up to prevent problems."[/COLOR]

[COLOR=333333]That's why the new mutations of sexe linked color come first by the female ? [/COLOR]

In the case of sex linked colors, no. The female cannot have two copies of the allele necessary to produce the sex linked color, so this particular quoted fact has no bearing on whether the male or female shows the gene first. In the case of sex linked colors it is often the female who does first because if she has one copy of the allele, she shows the color. If the male has only 1 copy of the gene, he does not display the color, he only carries it.

Therefore, if the new mutation occurs in a female, it shows immediately. If the new mutation occurs in a male it will not show until he is bred, and produces females that inherit the code for the new color (which they will then display, giving the appearance that were the first to have the mutation).

 

[WestKnollAmy]

Sex linked :
They say ...:

"Purple female x Blue male = Blue split Purple males and Blue females"

Why the Purple peahen Can not produce at least some Purple peachicks female ? .... female need only ONE gene Purple to show the sex linked color.This gene can't come from the mother ... why ?

As I understand it, the hen can not give her daughters the purple gene.

 

[Dany12]

All this new knowledge or clarification ... what about the mutation Peach !

They say ... :
"Peach first appeared in 1991 our of the original purple stock. Peach is strongly associated with cameo and purple stock (all known peaches can trace to both cameo and purple ancestors) and may be a linked double recessive (cameo + peach) rather than a separate mutation. Alternatively, purple and cameo may be alleles of the same gene-series and peach the split. The color is similar to cameo, but shifted to more red/pink tones. "

And if peach was only a mutation of the gene Z ( Cameo ) a mutation shifted to more red/pink tones of the Cameo gene !

 

[Birdrain92]

All this new knowledge or clarification ... what about the mutation Peach !

They say ... :
[COLOR=626262]"Peach first appeared in 1991 our of the original purple stock.  Peach is strongly associated with cameo and purple stock (all known peaches can trace to both cameo and purple ancestors) and may be a linked double recessive (cameo + peach) rather than a separate mutation. Alternatively, purple and cameo may be alleles of the same gene-series and peach the split. The color is similar to cameo, but shifted to more red/pink tones. " [/COLOR]

[COLOR=626262]And if peach was only a mutation of the gene Z ( Cameo ) a mutation shifted to more red/pink tones of the Cameo gene ![/COLOR]

When a Purple hen was bred to a Cameo cock it produced an IB split to Cameo and Purple cock. Because it didn't have two of the same alleles it didn't show. Since the two alleles were not on the same chromosome, it wasn't split to Peach. When the cock was fertile, during Prophase I, the two homologous chromosomes bound together. While they were bound, Purple or Cameo was copied onto the other chromosome, cross over. Then when Meiosis was complete, 1 of the 4 sperm cells carried a Peach allele. Then when the sperm cell fertilized an egg cell with a W chromosome it produced a Peach hen. Then the cock was bred to the Peach hen, because one sperm contained a Peach allele, and the egg cell carrying a Z chromosome was Peach it produced a Peach cock. Purple and Cameo mixed together leads to Incomplete dominance creating a new color.

 

[WestKnollAmy]

Quote:
Dude, I am glad you are on our side! I learn so much from you with every post. I may not remember it, but it is great to read your posts! You will do the peafowl a world of good through the years!

 

[Birdrain92]

[COLOR=0000CD]Dude, I am glad you are on our side! I learn so much from you with every post. I may not remember it, but it is great to read your posts! You will do the peafowl a world of good through the years![/COLOR]

Thank you! It's a good thing I understand genetics. I'm doing a research project for fun on peafowl dealing with the genetics. I'm going to be looking at the nucleotides though. So more in depth.

 

[WestKnollAmy]

Quote:
Definitely much more in depth than we ever got in college! But that was eons ago and I have tried to keep up but certainly can't. Just understanding the basics helps though. Thank you for continuously talking about it. I learn a little that way.