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

From: z88keys@mindspring.com (L.Zurbrigg)

>From: "Mark, Maureen" <MARKM@tc.gc.ca>
>
>Cindy,
>
>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). >>
>> >
>>This sounds convincing, - the white is recessive. However, these
>>seedlings, coming from the white parent, must have the a as well as the
>>A, and should yield some white seedlings if intercrossed, and even more
>>if crossed back to the white parent. In any case, I have enjoyed the
>>seedlings and their restricted but lovely stippling. Lloyd Zurbrigg in
>>Durham NC

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