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RE: CULT:SPEC: Lloyd's I. tectorum

From: "Mark, Maureen" <MARKM@tc.gc.ca>


Not quite.  If violet is dominant over white, then a heterozygous parent
(Aa) would be violet but have the white gene.  If you cross two heterozygous
parents (Aa X Aa), 25% would be homozygous violet (AA), 50% would be
heterozygous violet (Aa) and 25% would be homozygous white (aa).

If you take the progeny and do all the possible crosses, you get:

AA X Aa:  all violet -- 50% AA and 50% Aa
AA X aa:  all violet  -- 100% Aa
Aa X Aa:  75% violet (25% AA, 50% Aa), 25% white
aa X aa:  all white -- 100% aa

Maureen Mark
Ottawa, Canada (zone 4) -- where spring has turned back into Autumn and
still no signs of the bulletin 

> From: "sidneygardener" <sidneygardener@email.msn.com>
> I don't know much about genetics so I'm sure I won't be using the right
> terms, but is I. tectorum "Alba" truly different or is it a ressessive
> child
> from two violet parents? If it was originally from two violet parents
> wouldn't it stand to reason that it would usually give violet babies when
> selfed.  That is if violet is the dominate gene.
> These are questions, not statements.
> Cindy Rivera
> >In a message dated 11/24/99 10:34:18 AM Eastern Standard Time,
> BILLS@hsc.edu
> >writes:
> >
> ><< If album is self-pollinated (aa X
> > aa), then only white seedlings will result.  But if album is pollinated
> by
> > a pure-bred violet plant (aa X AA), all the seedlings will be Aa and
> hence
> > have pigment.  That would require the presence in the garden of
> pigmented
> > tectorum as well as the white.  (If two seedlings from the latter cross
> > were themselves crossed [Aa X Aa], then one-fourth of the seedlings
> would
> > be expected to be white). >>
> >

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