Re: HYB: oldies-sidebar

All of the answers given were correct. But to clarify, it is best to look at inheritence of yellow and pink in absence of anthocyanin.
The absence of the oil based cartenoids (yellows (beta and alpha carotene) and pink, lycopene) produces white. The presence of one (or more) of the catenoids genes produces a cartenoid flower. this is usually a yellow unless there are four sets of t gene, (tttt) , and then it is a pink. The "t" gene is unable to process lycopene into the further carotenes, alpha and beta carotene. It takes four sets of 't" to prevent pigment being converted from lycopene to carotene.
Inheritence of orange is a bit more complex, as it involves the prescence of both yellow and pink pigments. In this case the yellow is a recessive gene. Also a yellow with tangerine beard is also a recessive yellow.
There are yellow water soluble pigments, flavanoids. These operate on a seperate set of genetics.
So a white crossed with a pink will usually produce at least half of the offspring as having a cartenoid gene. If white does not have any '"t" genes then these will all be yellows (This is asumming that none of the offspring have anthocyanin.) Usually it would require the white to have at least two "t" genes in order to produce some pink seedlings. 

Chuck Chapman

Date: Fri, 31 Oct 2008 15:10:10 -0700 (PDT)
From: christian foster <flatnflashy@yahoo.com>
Subject: Re: [iris] HYB: oldies-sidebar

Linda,

I like the tone of yellow in your seedling... it's a lot like my
sunny yellow seedling.

I'm a bit confused.  When I look at your seedlings
pedigree I see;
yellow seedling: White named cultivar X pink seedling: (pink
named cultivar x pink over lavender bitone named cultivar)

This seems very
odd to me, but it is at least related to the question I was asking the other 
day about color genetics.

Is there anyone out there who can run through the
basic color genetics at play in this pedigree? I would assume Immortality is iiii for I inhibitor, and that the fall color on Celebration Song is affected by I inhibitor at some level. Are there any guesses how a yellow seedling 
resulted from a pedigree that appears to be weighted for pink?

Christian
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