Re: Dusky Challenger
- Subject: Re: Dusky Challenger
- From: e*
- Date: Wed, 26 Dec 2001 22:40:34 -0000
Thank you Sharon. The intriguing story page 62 and the follow up
page 119 lead me to jump to the genetics chapter page 374. I will
spend more time reading the glossary at the end of the chapter. Here
is a sample of terms someone with limited biology training would not
understand in the legend of the chart page 379: meiosis, haploid,
diploid, loci, heterozygous, kenetochores, and chromatids.
Here is a list of the irises I own:
AFFAIRE
ANTIGONE
BAHLOO
BEVERLY SILLS
BLUE RHYTHM
DUSKY CHALLENGER
ECLADOR
EGYPTIAN
KILT-LILT
LOOP-THE-LOOP
LOUVOIS
MME. Louis AUREAU
MADAME MAURICE LASSAILLY
MYSTIQUE
PACIFIC PANORAMA
POCAHONTAS
RANCHO ROSE
SNOW FLURRY
STEPPING OUT
VERT GALLANT
WELL ENDOWED
Bahloo seems to be having a hard time this winter. I am concerned
that it will not survive.
--- In iris-talk@y..., arilbredbreeder@c... wrote:
> In a message dated 12/26/01 7:48:16 AM Mountain Standard Time,
> ehenon@e... writes:
>
>
> > I am very excited about the book "The World of Irises" that Santa
> > brought for Christmas. Unfortunately, the genetics chapter went
over
> > my head. The lesson regarding the characteristics of diploids
and
> > tetraploids is beyond my grasp. I understand that Snow Flurry
was a
> > breakthrough but I am not sure I understand what happened in the
> > hybridization process that resulted in Snow Flurry. Can someone
> > explain in easy-to-understand terms?
>
> A brief account is presented on page 62 of TWOI. Its pod parent,
PURRISSIMA,
> was tetraploid. Its pollen parent, THAIS, was diploid. Crosses
like this
> contributed signifiantly to the development of our modern
tetraploid TBs, but
> the offspring are typically triploids. Once in a while, however,
an
> unreduced gamete results in a tetraploid offspring like SNOW
FLURRY.
>
> There's a diagram of meiosis on page 379, which shows how haploid
cells are
> normally produced from a diploid cell. If the Second Cellular
Division
> doesn't occur as shown, the result is an unreduced gamete that has
twice as
> many chromosomes as usual.
>
> The atypical two sets of chromosomes from its diploid parent, added
to the
> two sets from its tetraploid parent, made SNOW FLURRY
a "breakthrough"
> tetraploid in the sense that it broke a fertility barrier.
>
> Sharon McAllister
>
>
> [Non-text portions of this message have been removed]
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