Re: HYB: trying to learn some genetics terminology
iris@hort.net
  • Subject: Re: HYB: trying to learn some genetics terminology
  • From: C* C* <i*@aim.com>
  • Date: Fri, 22 Feb 2013 12:58:27 -0500 (EST)
As these plants are not siblings, seedlings of them would have to be an F1.
Labeling a cross as F1 only makes sense if you are going to make sibling crosses. Otherwise, no point in calling it F1. A designation used to help identify generations in line breeding. For genetics, used to identify genes, and their function, dominance etc. Or for hybridizing, pulling out recessive traits. Of course these can be positive and deleterious genes. 

Chuck Chapman

-----Original Message-----
From: Betty Wilkerson <autmirislvr@aol.com>
To: iris <iris@hort.net>
Sent: Fri, Feb 22, 2013 12:32 pm
Subject: Re: [iris] HYB: trying to learn some genetics terminology

So . . . the crosses Rick Ernst did with Edna's Wish & Wild Jasmine
were true F2 etc.?


Betty Wilkerson
Zone 6 KY
autmirislvr@aol.com



-----Original Message-----
From: Chuck Chapman <irischapman@aim.com>
To: iris <iris@hort.net>
Sent: Fri, Feb 22, 2013 10:55 am
Subject: Re: [iris] HYB: trying to learn some genetics terminology


F1 is original parental cross.  F2 is of siblings, and only of
siblings. A cross used in genetics to assess recessives. Used in plant
breeding to pull out recessives.The F2 and subsequent F3 etc, are all
sibling crosses. That is F3 is F2 X F2.Two parents from different lines
is always a F1. Cross of cousins is also F1.Chuck Chapman-----Original
Message-----From: Linda Mann <lmann@lock-net.com>To: iris
<iris@hort.net>Sent: Fri, Feb 22, 2013 11:08 amSubject: Re: [iris] HYB:
trying to learn some genetics terminologyThanks Chuck. After posting
that, I did some more reading and have a bitmore understanding of the
terminology.  Best summary was on the JacksonLaboratory mouse breeding
website.Is there nomenclature for offspring of F1 of one line X F1 of
another?Or is that just a plain ol parental cross, with seedlings of
that crosscalled F1?Same question for (a x b) x c.  I'm guessing
seedlings from that crossare also just an F1.I understand backcross and
outcross, but are there terms to use forintertwined pedigrees?  cousins
crossed?  nephews/nieces X aunts/uncles?  Inbreeding, but is there a
term for the offspring (and please don'trefer to hillbillies..;-) )?On
2/22/2013 6:59 AM, Chuck Chapman wrote:> F2 is always crossing of two
F1.>> Chuck Chapman>> -----Original Message-----> From: Linda Mann
<lmann@lock-net.com>> To: iris <iris@hort.net>> Sent: Thu, Feb 21, 2013
9:15 pm> Subject: [iris] HYB: trying to learn some genetics
terminology>> F1 & subsequent generations.>> Online definition says F2
is > The progeny of self-pollinated F1> generation plants>> But I've
also heard/read F2 used this way:>> The F2 (second filial) generation
consists of the offspring from> allowing the F1 individuals to
interbreed - the grandchildren of the> parental generation.>> So what
do I call the offspring of two related F1 seedlings that are not>
siblings, but are part of my non-line breeding program? i.e., crosses>
between half sibs, cousins, etc.>> I was assuming that any 2nd
generation away from the parental one was an> F2, but looks like that's
not the way F2 is normally used.>> Linda Mann>>
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