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Re: F2 and open Pollinated varieties versus F1

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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