Re: Chuck Chapman's "no subject"

Chuck,

Thanks for the correction about 1/4 to 1/6.  Actually it is probably slightly
different than one out of six when "tt" is present for the same complex of
reasons that one out of 100 can occur with TTTt--single factor carrier.  I
suspect the 1/100th was the ratio in the Purissima case with SQ-72/Pike's Peak
Pink anyway.  I never saw any t-bearded offspring from either Purissma or Snow
Flurry myself, but know that the family line does throw occasional or rare
t-bearded offspring.  As you point out, *The World of Irises* has an excellent
article on genetics of tetraploids.  The data makes ones brain ache, as Linda
Mann comments.  Why, oh why, couldn't the world be simple!  The article is
certainly one worth studying anyway.  Keeps one humble, no?

Neil Mogensen  z 6b/7a (supposedly) in western North Carolina

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