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 11:45:49 -0500 (EST)
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 am
Subject: Re: [iris] HYB: trying to learn some genetics terminology
Thanks Chuck. After posting that, I did some more reading and have a bit 
more understanding of the terminology.  Best summary was on the Jackson
Laboratory 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 cross
called F1?

Same question for (a x b) x c.  I'm guessing seedlings from that cross
are also just an F1.

I understand backcross and outcross, but are there terms to use for
intertwined pedigrees? cousins crossed? nephews/nieces X aunts/uncles? 
 Inbreeding, but is there a term for the offspring (and please don't
refer 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

---------------------------------------------------------------------
To sign-off this list, send email to majordomo@hort.net with the
message text UNSUBSCRIBE IRIS

---------------------------------------------------------------------
To sign-off this list, send email to majordomo@hort.net with the
message text UNSUBSCRIBE IRIS


---------------------------------------------------------------------
To sign-off this list, send email to majordomo@hort.net with the
message text UNSUBSCRIBE IRIS

---------------------------------------------------------------------
To sign-off this list, send email to majordomo@hort.net with the
message text UNSUBSCRIBE IRIS
Other Mailing lists | Author Index | Date Index | Subject Index | Thread Index