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 14:34:11 -0500 (EST)
Sibling to sibling  from an F1 =F2.

Siblings of F2 crossed  =F3.

Chuck Chapman

-----Original Message-----
From: Betty Wilkerson <autmirislvr@aol.com>
To: iris <iris@hort.net>
Sent: Fri, Feb 22, 2013 1:13 pm
Subject: Re: [iris] HYB: trying to learn some genetics terminology

The cross 'Edna's Wish' X 'Wild Jasmine' would be an F1, but there were
several sibling crosses made from these seedlings.  Would they not be
F2?  and their children F3?


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 12:01 pm
Subject: Re: [iris] HYB: trying to learn some genetics terminology


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 pmSubject: Re: [iris] HYB:
trying to learn some genetics terminologySo . . . the crosses Rick
Ernst did with Edna's Wish & Wild Jasminewere true F2 etc.?Betty
WilkersonZone 6 KYautmirislvr@aol.com-----Original Message-----From:
Chuck Chapman <irischapman@aim.com>To: iris <iris@hort.net>Sent: Fri,
Feb 22, 2013 10:55 amSubject: Re: [iris] HYB: trying to learn some
genetics terminologyF1 is original parental cross.  F2 is of siblings,
and only ofsiblings. A cross used in genetics to assess recessives.
Used in plantbreeding to pull out recessives.The F2 and subsequent F3
etc, are allsibling crosses. That is F3 is F2 X F2.Two parents from
different linesis always a F1. Cross of cousins is also F1.Chuck
Chapman-----OriginalMessage-----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 postingthat, I did some more reading and
have a bitmore understanding of theterminology.  Best summary was on
the JacksonLaboratory mouse breedingwebsite.Is there nomenclature for
offspring of F1 of one line X F1 ofanother?Or is that just a plain ol
parental cross, with seedlings ofthat crosscalled F1?Same question for
(a x b) x c.  I'm guessingseedlings from that crossare also just an
F1.I understand backcross andoutcross, but are there terms to use
forintertwined pedigrees?  cousinscrossed?  nephews/nieces X
aunts/uncles?  Inbreeding, but is there aterm for the offspring (and
please don'trefer to hillbillies..;-) )?On2/22/2013 6:59 AM, Chuck
Chapman wrote:> F2 is always crossing of twoF1.>> Chuck Chapman>>
-----Original Message-----> From: Linda Mann<lmann@lock-net.com>> To:
iris <iris@hort.net>> Sent: Thu, Feb 21, 20139:15 pm> Subject: [iris]
HYB: trying to learn some geneticsterminology>> F1 & subsequent
generations.>> Online definition says F2is > The progeny of
self-pollinated F1> generation plants>> But I'vealso heard/read F2 used
this way:>> The F2 (second filial) generationconsists of the offspring
from> allowing the F1 individuals tointerbreed - the grandchildren of
the> parental generation.>> So whatdo 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 2ndgeneration away from the parental one was an>
F2, but looks like that'snot the way F2 is normally used.>> Linda
Mann>>-------------------------------------------------------------------

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