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Re: Deep Water
Hi Wytze,
The homozygous rr crops are produced by crossing a pair of hemizygous
rr lines. The progeny are 25% homozygous, 50% hemizygous and 25% non-GM.
The homozygous forms are easily detected by backcrosing to hemizygous
rr, they yield only rr ( half homozygous and half hemizygous) or to non
GM where all are hemizygous (instead of the 50% in a hemizygous non GM
cross).
There are no rr alleles in non-GM crops, only in rr crops because the
rr insertion has no natural homologue.
In the cross between double rr and non GM both insertions are
hemizygous and not allelic, the results are a little different depending
on whether or not the insertions are on the same or different
chromosomes. I will give you the details of the cross if you wish but
not now because many may not have digested the first part.
Hope this helps, sincerely, Joe
geno@ZAP.A2000.NL wrote:
Hi Joe and Chuck,
What I do not understand yet is why RR soy, canola
and corn is homozygous and not hemizygous to start with. Where
does the transgenic allele comes from in GE plants? As far as I
understand the RR genetic construct there is only one RR gene
with possibly two copies of the CaMV promotor. Isn't that similar
with Cry genes?
And does a cross of homozygous transgene with non-GM always
become hemizygous? Can't it become homozygous?
I also have a question about what happens if you have a double rr
cross where none are silenced. Isn't it homozygous than?
wytze
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