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Re: F2 and open Pollinated varieties versus F1

Geez I feel like I'm in Biology 101 again!
Charity Hagen
cc013@ccosmo.net


----------
> From: Richard Grazzini <rickg@centrelab.com>
> To: seeds-list@eskimo.com
> Subject: Re: F2 and open Pollinated varieties versus F1
> Date: Tuesday, April 08, 1997 3:19 PM
> 
> Bob, 
> Good response.  Geneticist, are you?
> Rick
> 
> ----------
> > From: Bob Dunning <cliff@oz.net>
> > To: seeds-list@eskimo.com
> > Subject: Re: F2 and open Pollinated varieties versus F1
> > Date: Tuesday, April 08, 1997 5:59 PM
> > 
> > Open pollinated varieties are normal populations of a flowering plant
> with normally
> > varying distributions of gene frequencies across the population and
> between 
> > individuals.  Purebred strains have genetic variability radically
reduced
> by intensive
> > inbreeding and elimination of individuals that do not conform to the
> type.  F1 refers
> > to the first generation of a cross between two relatively purebred
> strains or between
> > two species.  The first generation is relatively uniform, often
> intermediate between
> > the two parent strains, but also often more vigorous than either parent
> strain.
> > 
> > There are two possible interpretations of F2.  Hybrid corn is usually
> produced by
> > crossing two F1 hybrids.  The resulting F2 generation is still
relatively
> uniform and
> > (depending on the cross) is still more vigorous than the F1 generation.
> > 
> > In the old Mendellian sense of F2, the F1 generation of a cross is used
> as the parents
> > of an F2 generation in which all the permutations of the genetic
> potential of the F1
> > cross are revealed, if you raise enough of the progeny (probably
> thousands).
> > 
> > I could go into detail about genetic frequencies in populations and the
> Hardy-Weinberg
> > principle.  I could explain about the probabilities of the various
> permutations in an
> > F2 generation..  Instead I will shut up.
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